Edit Profile (opens in new tab) Schmitt, Klaus Co-Author Distance Author ID: schmitt.klaus Published as: Schmitt, Klaus; Schmitt, K. Documents Indexed: 157 Publications since 1967, including 3 Books 2 Contributions as Editor Reviewing Activity: 3 Reviews Biographic References: 1 Publication Co-Authors: 60 Co-Authors with 117 Joint Publications 1,273 Co-Co-Authors all top 5 Co-Authors 40 single-authored 19 Le, Vy Khoi 8 Peitgen, Heinz-Otto 7 Manasevich, Raul F. 6 Schaaf, Renate 5 Bebernes, Jerrold W. 5 García-Huidobro, Marta 5 Mawhin, Jean 4 Ang, Dang Dinh 4 Dang, Hai 4 Gustafson, Grant B. 4 Hai, Dang Dinh 4 Smith, Hal Leslie 4 Wang, Zhi-Qiang 3 Brooks, Robert Morgan 3 Erbe, Lynn Harry 3 Nguyen Hoang Loc 2 Cosner, Chris 2 de Nevers, K. 2 Grimm, Louis J. 2 Jacobsen, Jon 2 Knobloch, Hans-Wilhelm 2 Lê, An 2 Maier-Paape, Stanislaus 2 Prüfer, Michael 2 Sagle, Art 2 Shivaji, Ratnasingham 2 Ward, James Robert jun. 1 Aguinaldo, L. 1 Cantrell, Robert Stephen 1 Clément, Philippe J. E. 1 Dancer, Edward Norman 1 Dunbar, Steven R. 1 Fonda, Alessandro 1 Gaines, Robert E. 1 Habets, Patrick 1 Hartenstine, David A. 1 Hoa, Le Hoan 1 Hutson, Vivian 1 Jäger, Willi 1 Jeggle, Hansgeorg 1 Kappel, Franz 1 Koizumi, Eiko 1 Le Hoan Hoa 1 Loc, Nguyen Hoang 1 Martelli, Mario 1 McGough, Jeff S. 1 Nguyen, Loc Hoang 1 Ortega, Rafael 1 Poppenberg, Markus 1 Robinson, Stephen B. 1 Rudd, Matthew B. 1 Rybakowski, Krzysztof P. 1 Sagle, Arthur A. 1 Saupe, Dietmar 1 Schiaffino, Andrea 1 Sim, Inbo 1 Tsai, Longyi 1 Volkmann, Peter 1 Walter, Wolfgang 1 Warner, Brandon W. all top 5 Serials 13 Journal of Differential Equations 10 Rocky Mountain Journal of Mathematics 8 Proceedings of the American Mathematical Society 8 Differential and Integral Equations 7 Electronic Journal of Differential Equations (EJDE) 7 Nonlinear Analysis. Theory, Methods & Applications 5 Advanced Nonlinear Studies 4 Journal of Mathematical Analysis and Applications 4 Results in Mathematics 4 Transactions of the American Mathematical Society 4 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 3 SIAM Journal on Applied Mathematics 2 ZAMP. Zeitschrift für angewandte Mathematik und Physik 2 Archiv der Mathematik 2 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 2 Topological Methods in Nonlinear Analysis 2 Calculus of Variations and Partial Differential Equations 2 Advances in Differential Equations 1 Mathematical Biosciences 1 Mathematical Methods in the Applied Sciences 1 Annali di Matematica Pura ed Applicata. Serie Quarta 1 Annales Polonici Mathematici 1 Archivum Mathematicum 1 Duke Mathematical Journal 1 Journal of the London Mathematical Society. Second Series 1 Journal für die Reine und Angewandte Mathematik 1 Mathematische Nachrichten 1 Mathematische Zeitschrift 1 Monatshefte für Mathematik 1 Rendiconti dell’Istituto di Matematica dell’Università di Trieste 1 Acta Applicandae Mathematicae 1 Mathematical and Computer Modelling 1 Aequationes Mathematicae 1 Annales de la Société Scientifique de Bruxelles. Série I 1 Communications in Partial Differential Equations 1 SIAM Journal on Mathematical Analysis 1 Journal of Dynamics and Differential Equations 1 The Canadian Applied Mathematics Quarterly 1 Bulletin of the Belgian Mathematical Society - Simon Stevin 1 NoDEA. Nonlinear Differential Equations and Applications 1 Discrete and Continuous Dynamical Systems 1 Vietnam Journal of Mathematics 1 Taiwanese Journal of Mathematics 1 Bulletin of the American Mathematical Society 1 Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences, Série A 1 Electronic Journal of Differential Equations. Monograph 1 Applied Mathematical Sciences 1 Lecture Notes in Mathematics 1 Annals of the University of Bucharest. Mathematical Series all top 5 Fields 84 Ordinary differential equations (34-XX) 80 Partial differential equations (35-XX) 24 Operator theory (47-XX) 18 Calculus of variations and optimal control; optimization (49-XX) 13 Global analysis, analysis on manifolds (58-XX) 5 Dynamical systems and ergodic theory (37-XX) 5 Numerical analysis (65-XX) 3 Biology and other natural sciences (92-XX) 2 General and overarching topics; collections (00-XX) 2 Functional analysis (46-XX) 2 Mechanics of deformable solids (74-XX) 1 History and biography (01-XX) 1 Nonassociative rings and algebras (17-XX) 1 Group theory and generalizations (20-XX) 1 Real functions (26-XX) 1 Measure and integration (28-XX) 1 Difference and functional equations (39-XX) 1 Integral equations (45-XX) 1 General topology (54-XX) 1 Algebraic topology (55-XX) 1 Mechanics of particles and systems (70-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 137 Publications have been cited 2,325 times in 1,842 Documents Cited by ▼ Year ▼ On the existence of soliton solutions to quasilinear Schrödinger equations. Zbl 1052.35060 Poppenberg, Markus; Schmitt, Klaus; Wang, Zhi-Qiang 340 2002 Permanence and the dynamics of biological systems. Zbl 0783.92002 Hutson, Vivian; Schmitt, Klaus 180 1992 The Liouville-Bratu-Gelfand problem for radial operators. Zbl 1015.34013 Jacobsen, Jon; Schmitt, Klaus 111 2002 On principal eigenvalues for quasilinear elliptic differential operators: an Orlicz-Sobolev space setting. Zbl 0936.35067 García-Huidobro, M.; Le, V. K.; Manásevich, R.; Schmitt, K. 101 1999 Mountain pass type solutions for quasilinear elliptic equations. Zbl 0959.35057 Clément, Ph.; García-Huidobro, M.; Manásevich, R.; Schmitt, K. 87 2000 Periodic boundary value problems for systems of second order differential equations. Zbl 0253.34020 Bebernes, J. W.; Schmitt, K. 54 1973 Boundary value problems for quasilinear second order elliptic equations. Zbl 0378.35022 Schmitt, Klaus 46 1978 Nonzero solutions of boundary value problems for second order ordinary and delay-differential equations. Zbl 0227.34017 Gustafson, Grant. B.; Schmitt, Klaus 43 1972 Global bifurcation in variational inequalities: applications to obstacle and unilateral problems. Zbl 0876.49008 Le, Vy Khoi; Schmitt, Klaus 41 1997 Boundary value problems for infinite systems of second order differential equations. Zbl 0302.34081 Schmitt, K.; Thompson, R. 40 1975 On positive solutions of semilinear elliptic equations. Zbl 0661.35031 Dancer, E. N.; Schmitt, Klaus 36 1987 On eigenvalue problems for nondifferentiable mappings. Zbl 0389.34019 Schmitt, K.; Smith, H. L. 34 1979 Nonlinear eigenvalue problems with the parameter near resonance. Zbl 0724.34025 Mawhin, Jean; Schmitt, Klaus 34 1990 Periodic solutions of systems of second-order differential equations. Zbl 0228.34023 Schmitt, Klaus 34 1972 Periodic solutions of nonlinear second order differential equations. Zbl 0153.12501 Schmitt, Klaus 33 1967 Positive solutions of quasilinear boundary value problems. Zbl 0893.34017 Hai, D. D.; Schmitt, K.; Shivaji, R. 31 1998 Landesman-Lazer type problems at an eigenvalue of odd multiplicity. Zbl 0780.35043 Mawhin, Jean; Schmitt, Klaus 30 1988 A nonlinear boundary value problem. Zbl 0198.12301 Schmitt, K. 28 1970 A class of nonlinear Sturm-Liouville problems with infinitely many solutions. Zbl 0657.34021 Schaaf, Renate; Schmitt, Klaus 27 1988 An application of the shooting method to boundary value problems for second order delay equations. Zbl 0219.34050 de Nevers, K.; Schmitt, K. 27 1971 Boundary value problems for differential equations with deviating arguments. Zbl 0198.13201 Grimm, L. J.; Schmitt, K. 25 1970 Invariant sets and the Hukuhara-Kneser property for systems of parabolic partial differential equations. Zbl 0377.35035 Bebernes, J. W.; Schmitt, K. 25 1977 On boundary value problems for degenerate quasilinear elliptic equations and inequalities. Zbl 0912.35069 Le, Vy Khoi; Schmitt, Klaus 24 1998 Existence of positive solutions for semilinear elliptic equations in annular domains. Zbl 0804.34021 Dang, H.; Schmitt, K. 24 1994 Positive solutions and conjugate points for systems of differential equations. Zbl 0379.34015 Schmitt, K.; Smith, H. L. 24 1978 Positive radial solutions of quasilinear elliptic partial differential equations on a ball. Zbl 0924.35047 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 22 1999 Non-linear boundary value problems for systems of differential equations. Zbl 0368.34009 Knobloch, H. W.; Schmitt, K. 22 1977 Persistence in models of predator-prey populations with diffusion. Zbl 0605.34044 Dunbar, S. R.; Rybakowski, K. P.; Schmitt, K. 21 1986 On the eigenvalue problem for coupled elliptic systems. Zbl 0606.35033 Cantrell, Robert Stephen; Schmitt, Klaus 21 1986 Radial solutions of quasilinear elliptic differential equations. Zbl 1091.34011 Jacobsen, Jon; Schmitt, Klaus 20 2004 Asymptotic behavior of positive solution branches of elliptic problems with linear part at resonance. Zbl 0759.35011 Schaaf, Renate; Schmitt, Klaus 20 1992 On the existence of maximal and minimal solutions for parabolic partial differential equations. Zbl 0399.35065 Bebernes, J. W.; Schmitt, K. 19 1979 Boundary value problems for singular elliptic equations. Zbl 1218.35107 Nguyen Hoang Loc; Schmitt, Klaus 18 2011 Quasilinear elliptic equations and inequalities with rapidly growing coefficients. Zbl 1013.35032 Le, Vy Khoi; Schmitt, Klaus 17 2000 Upper and lower solutions and semilinear second order elliptic equations with nonlinear boundary conditions. Zbl 0573.35029 Mawhin, J.; Schmitt, K. 17 1984 Boundary value problems for delay-differential equations. Zbl 0167.38504 Grimm, L. J.; Schmitt, K. 17 1968 Positive solutions for semilinear elliptic boundary value problems. Zbl 0846.35049 Schmitt, Klaus 16 1995 Minimization problems for noncoercive functionals subject to constraints. Zbl 0849.35040 Le, Vy Khoi; Schmitt, Klaus 16 1995 The contraction mapping principle and some applications. Zbl 1203.47093 Brooks, Robert M.; Schmitt, Klaus 16 2009 Some general concepts of sub- and supersolutions for nonlinear elliptic problems. Zbl 1293.35124 Le, Vy Khoi; Schmitt, Klaus 16 2006 Ambrosetti-Prodi-type problems for quasilinear elliptic problems. Zbl 1212.35142 Koizumi, Eiko; Schmitt, Klaus 16 2005 On bifurcation from infinity for potential operators. Zbl 0736.58014 Schmitt, Klaus; Wang, Zhiqiang 15 1991 Noncoercive variational inequalities: Some applications. Zbl 0735.49007 Ang, D. D.; Schmitt, K.; Le, Vy Khoi 15 1990 On Neumann problems for semilinear elliptic equations with critical nonlinearity: Existence and symmetry of multi-peaked solutions. Zbl 0895.35040 Maier-Paape, Stanislaus; Schmitt, Klaus; Wang, Zhi-Qiang 14 1997 A note on periodic solutions for delay-differential systems. Zbl 0273.34054 Gustafson, G. B.; Schmitt, K. 14 1974 Boundary value problems with jumping nonlinearities. Zbl 0631.35032 Schmitt, Klaus 14 1986 Variational inequalities of elliptic and parabolic type. Zbl 1330.35227 Rudd, Matthew; Schmitt, Klaus 13 2002 A multidimensional analogue of the Denjoy-Perron-Henstock-Kurzweil integral. Zbl 0929.26009 Ang, D. D.; Schmitt, K.; Le, Vy Khoi 13 1997 Nonlinear elliptic boundary value problems versus their finite difference approximations: numerically irrelevant solutions. Zbl 0449.65071 Peitgen, H. O.; Saupe, D.; Schmitt, K. 13 1981 On the number of solutions of boundary value problems involving the \(p\)-Laplacian. Zbl 0848.35050 Dang, Hai; Schmitt, Klaus; Shivaji, R. 13 1996 Global analysis of two-parameter elliptic eigenvalue problems. Zbl 0543.35039 Peitgen, H. O.; Schmitt, K. 13 1984 Comparison theorems for second order delay differential equations. Zbl 0226.34063 Schmitt, Klaus 13 1971 Periodic solutions of hereditary differential systems. Zbl 0254.34070 Gustafson, G. B.; Schmitt, Klaus 13 1973 Oscillatory perturbations of linear problems at resonance. Zbl 0674.35034 Costa, D.; Jeggle, H.; Schaaf, R.; Schmitt, K. 12 1988 Boundary value problems and comparison theorems for ordinary differential equations. Zbl 0279.34027 Schmitt, Klaus 12 1974 Sub-supersolution theorems for quasilinear elliptic problems: A variational approach. Zbl 1134.35308 Le, Vy Khoi; Schmitt, Klaus 11 2004 Periodic solutions of a forced nonlinear oscillator involving a onesided restoring force. Zbl 0399.34035 Schmitt, Klaus 11 1978 On positive solutions of quasilinear elliptic equations. Zbl 1240.35210 Loc, Nguyen Hoang; Schmitt, Klaus 11 2009 Boundary value problems for nonlinear second order differential equations. Zbl 0162.11502 Schmitt, Klaus 11 1968 Boundary value problems for second order differential equations in convex subsets of a Banach space. Zbl 0334.34054 Schmitt, Klaus; Volkmann, Peter 10 1976 On radial solutions of some semilinear elliptic equations. Zbl 0721.35020 Erbe, Lynn; Schmitt, Klaus 10 1988 Global aspects of the continuous and discrete Newton method: A case study. Zbl 0669.65038 Peitgen, H.-O.; Prüfer, M.; Schmitt, K. 10 1988 Delay and functional differential equations and their applications. Proceedings of a conference held at Park City, Utah, March 6–11, 1972. Zbl 0259.00008 10 1972 On solutions of nonlinear differential equations with deviating arguments. Zbl 0188.15704 Schmitt, Klaus 10 1969 On radial solutions of quasilinear boundary value problems. Zbl 0918.34027 Hai, D. D.; Schmitt, K. 9 1999 Some bifurcation results for a class of \(p\)-Laplacian like operators. Zbl 0879.34029 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 9 1997 Fixed point theorems of Krasnosel’skii type in locally convex spaces and applications to integral equations. Zbl 0808.47042 Le Hoan Hoa; Schmitt, Klaus 9 1994 Bifurcation problems associated with generalized Laplacians. Zbl 1220.35053 Schmitt, Klaus; Sim, Inbo 9 2004 Periodic perturbations of linear problems at resonance on convex domains. Zbl 0735.35058 Schaaf, Renate; Schmitt, Klaus 9 1990 Periodic solutions of some nonlinear delay-differential equations. Zbl 0433.34050 Martelli, Mario; Schmitt, Klaus; Smith, Hal 8 1980 Rothe and Altman type coincidence theorems and applications to differential equations. Zbl 0347.34028 Mawhin, J.; Schmitt, K. 8 1977 Pointwise completeness of differential-difference equations. Zbl 0256.34075 Brooks, R. M.; Schmitt, K. 8 1973 Applications of sub-supersolution theorems to singular nonlinear elliptic problems. Zbl 1229.35096 Nguyen Hoang Loc; Schmitt, Klaus 8 2011 Almost periodic solutions of nonlinear second order differential equations. Zbl 0756.34051 Schmitt, Klaus; Ward, James R. jun. 8 1992 On the boundary value problem \(u''+u=\alpha u^-+p(t),u(0)=0=u(\pi)\). Zbl 0385.34005 Aguinaldo, L.; Schmitt, K. 7 1978 Bernstein-Nagumo conditions and solutions to nonlinear differential inequalities. Zbl 1254.35252 Nguyen Hoang Loc; Schmitt, Klaus 7 2012 An existence theorem for periodic boundary value problems for systems of second order differential equations. Zbl 0284.34016 Bebernes, J.; Schmitt, K. 7 1973 Periodic solutions of nonlinear differential equations. Zbl 0215.44402 Schmitt, K. 7 1972 A note on periodic solutions of second order ordinary differential equations. Zbl 0238.34073 Schmitt, Klaus 7 1971 On solvability of boundary value problems for systems of differential equations. Zbl 0635.34016 Erbe, L.; Schmitt, K. 6 1987 Variational eigenvalues of degenerate eigenvalue problems for the weighted \(p\)-Laplacian. Zbl 1210.35175 Lê, An; Schmitt, Klaus 6 2005 Randwertaufgaben für gewöhnliche Differentialgleichungen. Zbl 0276.34012 Schmitt, Klaus 6 1973 Existence of periodic solutions for third and fourth order ordinary differential equations via coincidence degree. Zbl 0286.34056 Bebernes, J.; Gaines, R.; Schmitt, K. 6 1974 Asymptotic behavior of solution continua for semilinear elliptic problems. Zbl 0872.35037 Maier-Paape, Stanislaus; Schmitt, Klaus 5 1996 Positive radial solutions of some nonlinear partial differential equations. Zbl 0881.34032 Dang, Hai; Manásevich, Raúl; Schmitt, Klaus 5 1997 Boundary value problems for quasilinear second order differential equations. Zbl 0881.34034 Manásevich, R.; Schmitt, K. 5 1996 Periodic solutions of linear second order differential equations with deviating argument. Zbl 0207.08902 Schmitt, K. 5 1970 Revisiting the method of sub- and supersolutions for nonlinear elliptic problems. Zbl 1128.35029 Schmitt, Klaus 5 2007 Existence of solutions of a nonlinear boundary value problem via the method of lines. Zbl 0385.34007 Schmitt, K.; Thompson, R. C.; Walter, W. 5 1978 On the geometry of level sets of positive solutions of semilinear elliptic equations. Zbl 0706.35022 Cosner, Chris; Schmitt, Klaus 5 1988 Global topological perturbations of nonlinear elliptic eigenvalue problems. Zbl 0522.35044 Peitgen, H. O.; Schmitt, K. 5 1983 Nonlinear boundary value problems for systems of differential equations. Zbl 0501.34017 Habets, Patrick; Schmitt, Klaus 5 1983 Bounded solutions of nonlinear second order differential equations. Zbl 0182.12001 Schmitt, K. 5 1969 Periodic solutions of functional differential equations of retarded and neutral types in Banach spaces. Zbl 0842.34082 Hoa, Le Hoan; Schmitt, Klaus 4 1995 On principal eigenvalues of \(p\)-Laplacian-like operators. Zbl 0865.34066 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 4 1996 Boundary value problems for infinite systems of second order differential equations. Zbl 0278.34053 Schmitt, K.; Thompson, R. 4 1974 Periodic solutions of delay-differential equations. Zbl 0426.34060 Schmitt, Klaus 3 1979 Symmetry breaking in semilinear elliptic problems. Zbl 0708.35010 Jäger, Willi; Schmitt, Klaus 3 1990 Newton flows for real equations. Zbl 0665.58035 Peitgen, Heinz-Otto; Prüfer, Michael; Schmitt, Klaus 3 1988 Positive and spurious solutions of nonlinear eigenvalue problems. Zbl 0475.35071 Peitgen, H. O.; Schmitt, K. 3 1981 On parabolic variational inequalities with multivalued terms and convex functionals. Zbl 1388.58012 Le, Vy Khoi; Schmitt, Klaus 1 2018 On the existence of nontrivial solutions. Zbl 1448.34051 Schmitt, Klaus 2 2017 Remarks on second-order quadratic systems in algebras. Zbl 1372.34061 Sagle, Art; Schmitt, Klaus 1 2017 On a parabolic variational inequality related to a sandpile problem. Zbl 1338.35267 Le, Vy Khoi; Schmitt, Klaus 1 2015 Bernstein-Nagumo conditions and solutions to nonlinear differential inequalities. Zbl 1254.35252 Nguyen Hoang Loc; Schmitt, Klaus 7 2012 Nonlinear elliptic Dirichlet and no-flux boundary value problems. Zbl 1299.35025 Nguyen, Loc Hoang; Schmitt, Klaus 2 2012 Boundary value problems for singular elliptic equations. Zbl 1218.35107 Nguyen Hoang Loc; Schmitt, Klaus 18 2011 Applications of sub-supersolution theorems to singular nonlinear elliptic problems. Zbl 1229.35096 Nguyen Hoang Loc; Schmitt, Klaus 8 2011 On second-order quadratic systems and algebras. Zbl 1249.34032 Sagle, Art; Schmitt, Klaus 1 2011 Fixed set theorems for discrete dynamics and nonlinear boundary-value problems. Zbl 1246.37033 Brooks, Robert; Schmitt, Klaus; Warner, Brandon 1 2011 Equations and inequalities in Orlicz-Sobolev spaces: selected topics. Zbl 1220.35067 Vy Khoi Le; Schmitt, Klaus 2 2010 The contraction mapping principle and some applications. Zbl 1203.47093 Brooks, Robert M.; Schmitt, Klaus 16 2009 On positive solutions of quasilinear elliptic equations. Zbl 1240.35210 Loc, Nguyen Hoang; Schmitt, Klaus 11 2009 Revisiting the method of sub- and supersolutions for nonlinear elliptic problems. Zbl 1128.35029 Schmitt, Klaus 5 2007 Some general concepts of sub- and supersolutions for nonlinear elliptic problems. Zbl 1293.35124 Le, Vy Khoi; Schmitt, Klaus 16 2006 Ambrosetti-Prodi-type problems for quasilinear elliptic problems. Zbl 1212.35142 Koizumi, Eiko; Schmitt, Klaus 16 2005 Variational eigenvalues of degenerate eigenvalue problems for the weighted \(p\)-Laplacian. Zbl 1210.35175 Lê, An; Schmitt, Klaus 6 2005 Radial solutions of quasilinear elliptic differential equations. Zbl 1091.34011 Jacobsen, Jon; Schmitt, Klaus 20 2004 Sub-supersolution theorems for quasilinear elliptic problems: A variational approach. Zbl 1134.35308 Le, Vy Khoi; Schmitt, Klaus 11 2004 Bifurcation problems associated with generalized Laplacians. Zbl 1220.35053 Schmitt, Klaus; Sim, Inbo 9 2004 Periodic solutions of second order equations – a variational approach. Zbl 1157.34322 Schmitt, Klaus 2 2004 On generalized and viscosity solutions of nonlinear elliptic equations. Zbl 1142.35410 Hartenstine, David; Schmitt, Klaus 1 2004 On the existence of soliton solutions to quasilinear Schrödinger equations. Zbl 1052.35060 Poppenberg, Markus; Schmitt, Klaus; Wang, Zhi-Qiang 340 2002 The Liouville-Bratu-Gelfand problem for radial operators. Zbl 1015.34013 Jacobsen, Jon; Schmitt, Klaus 111 2002 Variational inequalities of elliptic and parabolic type. Zbl 1330.35227 Rudd, Matthew; Schmitt, Klaus 13 2002 Mountain pass type solutions for quasilinear elliptic equations. Zbl 0959.35057 Clément, Ph.; García-Huidobro, M.; Manásevich, R.; Schmitt, K. 87 2000 Quasilinear elliptic equations and inequalities with rapidly growing coefficients. Zbl 1013.35032 Le, Vy Khoi; Schmitt, Klaus 17 2000 Applications of variational identities to quasilinear elliptic differential equations. Zbl 0963.35066 McGough, J.; Schmitt, K. 1 2000 On principal eigenvalues for quasilinear elliptic differential operators: an Orlicz-Sobolev space setting. Zbl 0936.35067 García-Huidobro, M.; Le, V. K.; Manásevich, R.; Schmitt, K. 101 1999 Positive radial solutions of quasilinear elliptic partial differential equations on a ball. Zbl 0924.35047 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 22 1999 On radial solutions of quasilinear boundary value problems. Zbl 0918.34027 Hai, D. D.; Schmitt, K. 9 1999 On boundary value problems for quasilinear elliptic equations. Zbl 0922.35059 Schmitt, Klaus 1 1999 Positive solutions of quasilinear boundary value problems. Zbl 0893.34017 Hai, D. D.; Schmitt, K.; Shivaji, R. 31 1998 On boundary value problems for degenerate quasilinear elliptic equations and inequalities. Zbl 0912.35069 Le, Vy Khoi; Schmitt, Klaus 24 1998 Global bifurcation in variational inequalities: applications to obstacle and unilateral problems. Zbl 0876.49008 Le, Vy Khoi; Schmitt, Klaus 41 1997 On Neumann problems for semilinear elliptic equations with critical nonlinearity: Existence and symmetry of multi-peaked solutions. Zbl 0895.35040 Maier-Paape, Stanislaus; Schmitt, Klaus; Wang, Zhi-Qiang 14 1997 A multidimensional analogue of the Denjoy-Perron-Henstock-Kurzweil integral. Zbl 0929.26009 Ang, D. D.; Schmitt, K.; Le, Vy Khoi 13 1997 Some bifurcation results for a class of \(p\)-Laplacian like operators. Zbl 0879.34029 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 9 1997 Positive radial solutions of some nonlinear partial differential equations. Zbl 0881.34032 Dang, Hai; Manásevich, Raúl; Schmitt, Klaus 5 1997 On variational inequalities associated with the Navier-Stokes equation: Some bifurcation problems. Zbl 0916.35004 Le, Vy Khoi; Schmitt, Klaus 1 1997 On the number of solutions of boundary value problems involving the \(p\)-Laplacian. Zbl 0848.35050 Dang, Hai; Schmitt, Klaus; Shivaji, R. 13 1996 Asymptotic behavior of solution continua for semilinear elliptic problems. Zbl 0872.35037 Maier-Paape, Stanislaus; Schmitt, Klaus 5 1996 Boundary value problems for quasilinear second order differential equations. Zbl 0881.34034 Manásevich, R.; Schmitt, K. 5 1996 On principal eigenvalues of \(p\)-Laplacian-like operators. Zbl 0865.34066 García-Huidobro, M.; Manásevich, R.; Schmitt, K. 4 1996 Minimization problems for noncoercive functionals subject to constraints. II. Zbl 1020.35025 Le, Vy Khoi; Schmitt, Klaus 1 1996 Positive solutions for semilinear elliptic boundary value problems. Zbl 0846.35049 Schmitt, Klaus 16 1995 Minimization problems for noncoercive functionals subject to constraints. Zbl 0849.35040 Le, Vy Khoi; Schmitt, Klaus 16 1995 Periodic solutions of functional differential equations of retarded and neutral types in Banach spaces. Zbl 0842.34082 Hoa, Le Hoan; Schmitt, Klaus 4 1995 Existence of nonnegative solutions for semilinear elliptic equations with subcritical exponents. Zbl 0836.35051 Dang, Hai; Schmitt, Klaus 1 1995 Existence of positive solutions for semilinear elliptic equations in annular domains. Zbl 0804.34021 Dang, H.; Schmitt, K. 24 1994 Fixed point theorems of Krasnosel’skii type in locally convex spaces and applications to integral equations. Zbl 0808.47042 Le Hoan Hoa; Schmitt, Klaus 9 1994 Existence and uniqueness results for nonlinear boundary value problems. Zbl 0807.34025 Hai, D. D.; Schmitt, K. 2 1994 Boundary value problem for higher order nonlinear differential equations. Zbl 0789.34024 Dang Dinh Hai; Schmitt, Klaus 1 1993 Permanence and the dynamics of biological systems. Zbl 0783.92002 Hutson, Vivian; Schmitt, Klaus 180 1992 Asymptotic behavior of positive solution branches of elliptic problems with linear part at resonance. Zbl 0759.35011 Schaaf, Renate; Schmitt, Klaus 20 1992 Almost periodic solutions of nonlinear second order differential equations. Zbl 0756.34051 Schmitt, Klaus; Ward, James R. jun. 8 1992 Periodic and almost periodic solutions of nonlinear evolution equations. Zbl 0820.34024 Schmitt, Klaus; Ward, James R. jun. 2 1992 \(P\)-coercive variational inequalities and unilateral problems for von Karman’s equations. Zbl 0830.49011 Ang, D. D.; Schmitt, K.; Le, Vy Khoi 1 1992 On bifurcation from infinity for potential operators. Zbl 0736.58014 Schmitt, Klaus; Wang, Zhiqiang 15 1991 Nonlinear eigenvalue problems with the parameter near resonance. Zbl 0724.34025 Mawhin, Jean; Schmitt, Klaus 34 1990 Noncoercive variational inequalities: Some applications. Zbl 0735.49007 Ang, D. D.; Schmitt, K.; Le, Vy Khoi 15 1990 Periodic perturbations of linear problems at resonance on convex domains. Zbl 0735.35058 Schaaf, Renate; Schmitt, Klaus 9 1990 Symmetry breaking in semilinear elliptic problems. Zbl 0708.35010 Jäger, Willi; Schmitt, Klaus 3 1990 On the number of solutions of semilinear elliptic problems at resonance: Some numerical experiments. Zbl 0727.35052 Schaaf, Renate; Schmitt, Klaus 1 1990 Landesman-Lazer type problems at an eigenvalue of odd multiplicity. Zbl 0780.35043 Mawhin, Jean; Schmitt, Klaus 30 1988 A class of nonlinear Sturm-Liouville problems with infinitely many solutions. Zbl 0657.34021 Schaaf, Renate; Schmitt, Klaus 27 1988 Oscillatory perturbations of linear problems at resonance. Zbl 0674.35034 Costa, D.; Jeggle, H.; Schaaf, R.; Schmitt, K. 12 1988 On radial solutions of some semilinear elliptic equations. Zbl 0721.35020 Erbe, Lynn; Schmitt, Klaus 10 1988 Global aspects of the continuous and discrete Newton method: A case study. Zbl 0669.65038 Peitgen, H.-O.; Prüfer, M.; Schmitt, K. 10 1988 On the geometry of level sets of positive solutions of semilinear elliptic equations. Zbl 0706.35022 Cosner, Chris; Schmitt, Klaus 5 1988 Newton flows for real equations. Zbl 0665.58035 Peitgen, Heinz-Otto; Prüfer, Michael; Schmitt, Klaus 3 1988 Periodic solutions of systems of ordinary differential equations which approximate delay equations. Zbl 0715.34122 Kappel, F.; Schmitt, Klaus 1 1988 On positive solutions of semilinear elliptic equations. Zbl 0661.35031 Dancer, E. N.; Schmitt, Klaus 36 1987 On solvability of boundary value problems for systems of differential equations. Zbl 0635.34016 Erbe, L.; Schmitt, K. 6 1987 Boundary value problems for second order differential equations. Zbl 0636.34012 Erbe, L.; Schmitt, K. 1 1987 Geometric properties and bounds for positive solutions of semilinear elliptic equations. Zbl 0639.35027 Schmitt, Klaus 1 1987 Persistence in models of predator-prey populations with diffusion. Zbl 0605.34044 Dunbar, S. R.; Rybakowski, K. P.; Schmitt, K. 21 1986 On the eigenvalue problem for coupled elliptic systems. Zbl 0606.35033 Cantrell, Robert Stephen; Schmitt, Klaus 21 1986 Boundary value problems with jumping nonlinearities. Zbl 0631.35032 Schmitt, Klaus 14 1986 A priori bounds for positive solutions of a semilinear elliptic equation. Zbl 0577.35041 Cosner, Chris; Schmitt, Klaus 3 1985 Corrigendum: Upper and lower solutions and semilinear second order elliptic equations with nonlinear boundary conditions. Zbl 0596.35045 Mawhin, J.; Schmitt, K. 3 1985 Upper and lower solutions and semilinear second order elliptic equations with nonlinear boundary conditions. Zbl 0573.35029 Mawhin, J.; Schmitt, K. 17 1984 Global analysis of two-parameter elliptic eigenvalue problems. Zbl 0543.35039 Peitgen, H. O.; Schmitt, K. 13 1984 Periodic solutions of a class of nonlinear evolution equations. Zbl 0559.35003 Schiaffino, Andrea; Schmitt, K. 1 1984 Global topological perturbations of nonlinear elliptic eigenvalue problems. Zbl 0522.35044 Peitgen, H. O.; Schmitt, K. 5 1983 Nonlinear boundary value problems for systems of differential equations. Zbl 0501.34017 Habets, Patrick; Schmitt, Klaus 5 1983 Fredholm alternatives for nonlinear differential equations. Zbl 0527.34017 Schmitt, Klaus; Smith, Hal 2 1982 Nonlinear elliptic boundary value problems versus their finite difference approximations: numerically irrelevant solutions. Zbl 0449.65071 Peitgen, H. O.; Saupe, D.; Schmitt, K. 13 1981 Positive and spurious solutions of nonlinear eigenvalue problems. Zbl 0475.35071 Peitgen, H. O.; Schmitt, K. 3 1981 Oscillations in nonlinear differential-delay equations. Zbl 0476.34060 Schmitt, K. 2 1981 Periodic solutions of some nonlinear delay-differential equations. Zbl 0433.34050 Martelli, Mario; Schmitt, Klaus; Smith, Hal 8 1980 Perturbations topologiques globales des problèmes non-linéaires aux valeurs propres. Zbl 0445.35044 Peitgen, Heinz-Otto; Schmitt, Klaus 1 1980 Perturbations topologiques globales des problèmes non linéaires aux valeurs propres. Zbl 0458.35079 Peitgen, Heinz-Otto; Schmitt, Klaus 1 1980 On eigenvalue problems for nondifferentiable mappings. Zbl 0389.34019 Schmitt, K.; Smith, H. L. 34 1979 On the existence of maximal and minimal solutions for parabolic partial differential equations. Zbl 0399.35065 Bebernes, J. W.; Schmitt, K. 19 1979 Periodic solutions of delay-differential equations. Zbl 0426.34060 Schmitt, Klaus 3 1979 Boundary value problems for quasilinear second order elliptic equations. Zbl 0378.35022 Schmitt, Klaus 46 1978 Positive solutions and conjugate points for systems of differential equations. Zbl 0379.34015 Schmitt, K.; Smith, H. L. 24 1978 Periodic solutions of a forced nonlinear oscillator involving a onesided restoring force. Zbl 0399.34035 Schmitt, Klaus 11 1978 On the boundary value problem \(u''+u=\alpha u^-+p(t),u(0)=0=u(\pi)\). Zbl 0385.34005 Aguinaldo, L.; Schmitt, K. 7 1978 ...and 37 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 1,937 Authors 45 Schmitt, Klaus 30 Le, Vy Khoi 23 Ma, Ruyun 22 Mawhin, Jean 22 Wang, Zhi-Qiang 21 Zanolin, Fabio 20 Agarwal, Ravi P. 19 Severo, Uberlandio Batista 18 Tang, Xianhua 17 Hai, Dang Dinh 16 Da Silva, Edcarlos Domingos 16 Do Ó, João M. Bezerra 16 Rădulescu, Vicenţiu D. 16 Wu, Xian 15 Figueiredo, Giovany Malcher 15 Liu, Jiaquan 14 Cosner, Chris 14 Deng, Yinbin 14 Guo, Yuxia 14 O’Regan, Donal 14 Thompson, Harold Bevan 13 Mihăilescu, Mihai 13 Miyagaki, Olimpio Hiroshi 12 Papageorgiou, Nikolaos S. 12 Wang, Youjun 11 Chen, Jianhua 11 Manasevich, Raul F. 11 Santos, Carlos Alberto P. 11 Shivaji, Ratnasingham 11 Tang, Chun-Lei 10 Aliyev, Ziyatkhan S. 10 Cantrell, Robert Stephen 10 Carl, Siegfried 10 Cheng, Bitao 10 Henderson, Johnny Lee 10 Liu, Lishan 10 Xue, Yanfang 9 Ahmad, Shair 9 Alves, Claudianor Oliveira 9 Erbe, Lynn Harry 9 Abreu Goncalves, Jose Valdo 9 Kim, Yunho 9 Schreiber, Sebastian J. 9 Wong, Fu-Hsiang 8 Buonomo, Bruno 8 Chen, Jianqing 8 Dancer, Edward Norman 8 Dong, Ge 8 Lakshmikantham, Vangipuram 8 Omari, Pierpaolo 8 Ruan, Shigui 8 Shi, Junping 8 Teng, Kaimin 8 Yang, Xian Yong 7 Andres, Jan 7 Bonanno, Gabriele 7 Cañada Villar, Antonio 7 Chen, Haibo 7 Eloe, Paul W. 7 García-Huidobro, Marta 7 Huang, Chen 7 Huang, Xianjiu 7 Krawcewicz, Wieslaw Z. 7 Liu, Duchao 7 Motreanu, Dumitru 7 Shi, Hongxia 7 Teng, Zhi-dong 7 Yang, Zuodong 7 Zhao, Xiao-Qiang 6 Bebernes, Jerrold W. 6 Bowong, Samuel 6 Carvalho, Marcos L. M. 6 Chen, Caisheng 6 Sobreira de Araujo Corrêa, Francisco Julio 6 Fang, Fei 6 Girg, Petr 6 Habets, Patrick 6 Jia, Gao 6 Kang, Yun 6 Korman, Philip L. 6 Li, Quanqing 6 Liu, Haidong 6 Liu, Xiangqing 6 Miyamoto, Yasuhito 6 Moreira, Sandra Imaculada 6 Nie, Jianjun 6 Nkashama, Mubenga N. 6 Petryshyn, Walter Wolodymyr 6 Precup, Radu 6 Salort, Ariel Martin 6 Sanchez, Luís 6 Tanaka, Satoshi 6 Wang, Jixiu 6 Ward, James Robert jun. 6 Wei, Juncheng 6 Wu, Yonghong 6 Yang, Minbo 6 Zhang, Jian 5 Amster, Pablo 5 Balanov, Zalman I. ...and 1,837 more Authors all top 5 Cited in 299 Serials 180 Journal of Mathematical Analysis and Applications 131 Journal of Differential Equations 118 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 73 Nonlinear Analysis. Theory, Methods & Applications 50 Applied Mathematics and Computation 45 Boundary Value Problems 33 Proceedings of the American Mathematical Society 31 Complex Variables and Elliptic Equations 28 Computers & Mathematics with Applications 28 Mathematical Methods in the Applied Sciences 27 Calculus of Variations and Partial Differential Equations 26 Applicable Analysis 25 Journal of Mathematical Physics 25 Rocky Mountain Journal of Mathematics 25 Applied Mathematics Letters 23 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 23 Advanced Nonlinear Studies 20 Annali di Matematica Pura ed Applicata. Serie Quarta 20 Communications on Pure and Applied Analysis 19 Journal of Computational and Applied Mathematics 19 Topological Methods in Nonlinear Analysis 19 Nonlinear Analysis. Real World Applications 18 Discrete and Continuous Dynamical Systems 15 Mathematical Biosciences 15 Mediterranean Journal of Mathematics 15 Advances in Nonlinear Analysis 14 Mathematische Nachrichten 14 Transactions of the American Mathematical Society 14 Journal of Fixed Point Theory and Applications 13 ZAMP. Zeitschrift für angewandte Mathematik und Physik 13 Results in Mathematics 13 NoDEA. Nonlinear Differential Equations and Applications 13 Communications in Contemporary Mathematics 12 Journal of Mathematical Biology 12 Electronic Journal of Differential Equations (EJDE) 11 Archiv der Mathematik 11 Abstract and Applied Analysis 11 Communications in Nonlinear Science and Numerical Simulation 10 Journal of Functional Analysis 10 Monatshefte für Mathematik 10 Journal of Dynamics and Differential Equations 9 Applied Numerical Mathematics 9 International Journal of Bifurcation and Chaos in Applied Sciences and Engineering 8 Mathematica Slovaca 8 Discrete and Continuous Dynamical Systems. Series S 7 Numerische Mathematik 7 Acta Applicandae Mathematicae 7 Mathematical and Computer Modelling 7 The Journal of Geometric Analysis 7 Communications in Partial Differential Equations 6 Chaos, Solitons and Fractals 6 Proceedings of the Edinburgh Mathematical Society. Series II 6 Rendiconti del Circolo Matemàtico di Palermo. Serie II 6 Tôhoku Mathematical Journal. Second Series 6 Journal of Difference Equations and Applications 6 Differential Equations and Dynamical Systems 6 Journal of Applied Mathematics and Computing 5 Archive for Rational Mechanics and Analysis 5 Bulletin of the Australian Mathematical Society 5 Annales Polonici Mathematici 5 Mathematics and Computers in Simulation 5 Zeitschrift für Analysis und ihre Anwendungen 5 Acta Mathematicae Applicatae Sinica. English Series 5 Proceedings of the Indian Academy of Sciences. Mathematical Sciences 5 Georgian Mathematical Journal 5 Taiwanese Journal of Mathematics 5 Discrete Dynamics in Nature and Society 5 Qualitative Theory of Dynamical Systems 5 Journal of Applied Mathematics 5 Acta Mathematica Scientia. Series B. (English Edition) 5 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 5 Milan Journal of Mathematics 5 Fixed Point Theory and Applications 5 Open Mathematics 5 AIMS Mathematics 4 Mathematical Notes 4 Bulletin of Mathematical Biology 4 Applied Mathematics and Optimization 4 Czechoslovak Mathematical Journal 4 Journal of Optimization Theory and Applications 4 Ricerche di Matematica 4 Physica D 4 Asymptotic Analysis 4 Applied Mathematical Modelling 4 Advances in Differential Equations 4 Journal of Mathematical Chemistry 4 Nonlinear Dynamics 4 Comptes Rendus. Mathématique. Académie des Sciences, Paris 4 Analysis and Applications (Singapore) 4 Advances in Difference Equations 4 International Journal of Biomathematics 4 Journal of Applied Analysis and Computation 4 Journal of Function Spaces 4 International Journal of Applied and Computational Mathematics 3 Indian Journal of Pure & Applied Mathematics 3 Nonlinearity 3 Aplikace Matematiky 3 Journal of Soviet Mathematics 3 Manuscripta Mathematica 3 Mathematische Annalen ...and 199 more Serials all top 5 Cited in 47 Fields 1,010 Partial differential equations (35-XX) 659 Ordinary differential equations (34-XX) 260 Operator theory (47-XX) 191 Biology and other natural sciences (92-XX) 140 Numerical analysis (65-XX) 108 Calculus of variations and optimal control; optimization (49-XX) 94 Global analysis, analysis on manifolds (58-XX) 89 Dynamical systems and ergodic theory (37-XX) 79 Functional analysis (46-XX) 33 Difference and functional equations (39-XX) 28 Real functions (26-XX) 24 Mechanics of deformable solids (74-XX) 21 Integral equations (45-XX) 19 Fluid mechanics (76-XX) 18 Systems theory; control (93-XX) 13 General topology (54-XX) 11 Optics, electromagnetic theory (78-XX) 11 Quantum theory (81-XX) 9 Probability theory and stochastic processes (60-XX) 9 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 8 Differential geometry (53-XX) 8 Statistical mechanics, structure of matter (82-XX) 8 Operations research, mathematical programming (90-XX) 5 Mechanics of particles and systems (70-XX) 4 Potential theory (31-XX) 4 Convex and discrete geometry (52-XX) 4 Computer science (68-XX) 4 Classical thermodynamics, heat transfer (80-XX) 3 Measure and integration (28-XX) 3 Special functions (33-XX) 3 Harmonic analysis on Euclidean spaces (42-XX) 3 Algebraic topology (55-XX) 2 Topological groups, Lie groups (22-XX) 2 Approximations and expansions (41-XX) 2 Abstract harmonic analysis (43-XX) 2 Integral transforms, operational calculus (44-XX) 2 Geophysics (86-XX) 1 History and biography (01-XX) 1 Combinatorics (05-XX) 1 Commutative algebra (13-XX) 1 Linear and multilinear algebra; matrix theory (15-XX) 1 Nonassociative rings and algebras (17-XX) 1 Group theory and generalizations (20-XX) 1 Functions of a complex variable (30-XX) 1 Several complex variables and analytic spaces (32-XX) 1 Statistics (62-XX) 1 Astronomy and astrophysics (85-XX) Citations by Year