Berkovits, J.; Miettunen, M. On the uniqueness of the Browder degree. (English) Zbl 1177.47064 Proc. Am. Math. Soc. 136, No. 10, 3467-3476 (2008). Reviewer: Martin Väth (Praha) MSC: 47H11 47H05 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{M. Miettunen}, Proc. Am. Math. Soc. 136, No. 10, 3467--3476 (2008; Zbl 1177.47064) Full Text: DOI
Berkovits, J. Ambrosetti - Prodi type multiplicity result for a wave equation with sublinear nonlinearity. (English) Zbl 1160.35051 J. Math. Anal. Appl. 332, No. 1, 691-699 (2007). Reviewer: Guy Katriel (Haifa) MSC: 35L70 47H11 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Math. Anal. Appl. 332, No. 1, 691--699 (2007; Zbl 1160.35051) Full Text: DOI
Berkovits, J. A reduction theorem for the topological degree for mappings of class \((S+)\). (English) Zbl 1117.47047 Proc. Am. Math. Soc. 135, No. 7, 2059-2064 (2007). Reviewer: Grzegorz Gabor (Toruń) MSC: 47H11 47J05 PDFBibTeX XMLCite \textit{J. Berkovits}, Proc. Am. Math. Soc. 135, No. 7, 2059--2064 (2007; Zbl 1117.47047) Full Text: DOI
Berkovits, J. Extension of the Leray-Schauder degree for abstract Hammerstein type mappings. (English) Zbl 1114.47049 J. Differ. Equations 234, No. 1, 289-310 (2007). Reviewer: Radu Precup (Cluj-Napoca) MSC: 47H11 47H05 47N20 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 234, No. 1, 289--310 (2007; Zbl 1114.47049) Full Text: DOI
Berkovits, J.; Fabry, C. An extension of the topological degree in Hilbert space. (English) Zbl 1117.47048 Abstr. Appl. Anal. 2005, No. 6, 581-597 (2005). Reviewer: Martin Väth (Würzburg) MSC: 47H11 47H05 47J05 58C30 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{C. Fabry}, Abstr. Appl. Anal. 2005, No. 6, 581--597 (2005; Zbl 1117.47048) Full Text: DOI EuDML
Berkovits, J.; Fabry, C. Semilinear problems with a non-symmetric linear part having an infinite dimensional kernel. (English) Zbl 1082.47055 Port. Math. (N.S.) 61, No. 4, 439-459 (2004). Reviewer: Peter Zabreiko (Minsk) MSC: 47J05 47H11 47J25 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{C. Fabry}, Port. Math. (N.S.) 61, No. 4, 439--459 (2004; Zbl 1082.47055) Full Text: EuDML
Berkovits, J.; Leinfelder, H.; Mustonen, V. Periodic solutions of nonlinear vibrating beams. (English) Zbl 1074.35084 Abstr. Appl. Anal. 2003, No. 14, 823-841 (2003). Reviewer: Petr Necesal (Plzen) MSC: 35Q72 35B10 35L35 47H11 47N20 74K10 74H45 PDFBibTeX XMLCite \textit{J. Berkovits} et al., Abstr. Appl. Anal. 2003, No. 14, 823--841 (2003; Zbl 1074.35084) Full Text: DOI EuDML
Berkovits, Juha; Leinfelder, Herbert; Mustonen, Vesa Existence and multiplicity results for wave equations with time-independent nonlinearity. (English) Zbl 1047.35100 Topol. Methods Nonlinear Anal. 22, No. 2, 273-295 (2003). Reviewer: Jean Mawhin (Louvain-La-Neuve) MSC: 35L70 35B10 47H11 35L20 PDFBibTeX XMLCite \textit{J. Berkovits} et al., Topol. Methods Nonlinear Anal. 22, No. 2, 273--295 (2003; Zbl 1047.35100) Full Text: DOI
Berkovits, Juha On the bifurcation of large amplitude solutions for a system of wave and beam equations. (English) Zbl 1028.35021 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 52, No. 1, 343-354 (2003). Reviewer: V.Mustonen (Oulu) MSC: 35B32 35L70 35L75 74K10 PDFBibTeX XMLCite \textit{J. Berkovits}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 52, No. 1, 343--354 (2003; Zbl 1028.35021) Full Text: DOI
Berkovits, Juha; Mustonen, Vesa Hyperbolic systems with linear coupling: resonance with respect to the matrix spectrum. (English) Zbl 1042.35616 Nonlinear Anal., Theory Methods Appl. 47, No. 5, 2893-2904 (2001). MSC: 35Q72 47H11 47N20 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 47, No. 5, 2893--2904 (2001; Zbl 1042.35616) Full Text: DOI
Berkovits, Juha On the solvability of a system of wave and beam equations. (English) Zbl 1006.47054 Abstr. Appl. Anal. 6, No. 4, 215-228 (2001). Reviewer: Christian Fenske (Gießen) MSC: 47N20 47H11 47J05 35B10 35Q72 47H30 PDFBibTeX XMLCite \textit{J. Berkovits}, Abstr. Appl. Anal. 6, No. 4, 215--228 (2001; Zbl 1006.47054) Full Text: DOI EuDML Link
Berkovits, Juha On the Leray-Schauder formula and bifurcation. (English) Zbl 0992.47030 J. Differ. Equations 173, No. 2, 451-469 (2001). Reviewer: Ulrich Kosel (Freiberg) MSC: 47J15 47H11 35L05 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 173, No. 2, 451--469 (2001; Zbl 0992.47030) Full Text: DOI
Berkovits, Juha On the degree theory for densely defined mappings of class \((S_+)_L\). (English) Zbl 0991.47049 Abstr. Appl. Anal. 4, No. 3, 141-152 (1999). Reviewer: Peter Zabreiko (Minsk) MSC: 47H11 35J60 PDFBibTeX XMLCite \textit{J. Berkovits}, Abstr. Appl. Anal. 4, No. 3, 141--152 (1999; Zbl 0991.47049) Full Text: DOI EuDML Link
Berkovits, J. Some extensions of topological degree theory with applications to nonlinear problems. (English) Zbl 0906.47047 Drábek, Pavel (ed.), Topological and variational methods for nonlinear boundary value problems. Proceedings of the 20th seminar in partial differential equations, Cholín, Czech Republic, June 5–9, 1995. Harlow: Longman. Pitman Res. Notes Math. Ser. 365, 1-29 (1997). Reviewer: V.Mustonen (Oulu) MSC: 47H11 35L70 PDFBibTeX XMLCite \textit{J. Berkovits}, Pitman Res. Notes Math. Ser. 365, 1--29 (1997; Zbl 0906.47047)
Berkovits, Juha; Mustonen, Vesa On nonresonance for systems of semilinear wave equations. (English) Zbl 0887.35013 Nonlinear Anal., Theory Methods Appl. 29, No. 6, 627-638 (1997). Reviewer: J.Mawhin (Louvain-La-Neuve) MSC: 35B10 47H11 35L70 35L20 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Nonlinear Anal., Theory Methods Appl. 29, No. 6, 627--638 (1997; Zbl 0887.35013) Full Text: DOI
Berkovits, Juha Local bifurcation results for systems of semilinear equations. (English) Zbl 0877.58017 J. Differ. Equations 133, No. 2, 245-254 (1997). Reviewer: V.Moroz (Minsk) MSC: 58E07 47J10 35L70 55M25 47H11 PDFBibTeX XMLCite \textit{J. Berkovits}, J. Differ. Equations 133, No. 2, 245--254 (1997; Zbl 0877.58017) Full Text: DOI
Berkovits, Juha; Mustonen, Vesa On systems of telegraph equations. (English) Zbl 0863.35056 Rákosník, Jiří(ed.), Function spaces, differential operators and nonlinear analysis. Proceedings of the conference held in Paseky nad Jizerou, Czech Republic, September 3-9, 1995. Prague: Prometheus Publishing House. 125-140 (1996). MSC: 35L20 47H11 35L70 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, in: Function spaces, differential operators and nonlinear analysis. Proceedings of the conference held in Paseky nad Jizerou, Czech Republic, September 3-9, 1995. Prague: Prometheus Publishing House. 125--140 (1996; Zbl 0863.35056)
Berkovits, Juha; Tienari, Matti Topological degree theory for some classes of multis with applications to hyperbolic and elliptic problems involving discontinuous nonlinearities. (English) Zbl 0851.47044 Dyn. Syst. Appl. 5, No. 1, 1-18 (1996). MSC: 47J25 47H11 58C06 35R05 47H04 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{M. Tienari}, Dyn. Syst. Appl. 5, No. 1, 1--18 (1996; Zbl 0851.47044)
Ben-Naoum, A. K.; Berkovits, J. Nontrivial solutions for some semilinear problems and applications to wave equations on balls and spheres. (English) Zbl 0863.47043 Topol. Methods Nonlinear Anal. 5, No. 1, 177-192 (1995). Reviewer: J.Hernandez (Madrid) MSC: 47H11 47J05 35B10 47H30 35L05 PDFBibTeX XMLCite \textit{A. K. Ben-Naoum} and \textit{J. Berkovits}, Topol. Methods Nonlinear Anal. 5, No. 1, 177--192 (1995; Zbl 0863.47043) Full Text: DOI
Berkovits, Juha Some bifurcation results for a class of semilinear equations via topological degree method. (English) Zbl 0783.47069 Bull. Soc. Math. Belg., Sér. B 44, No. 3, 237-247 (1992). Reviewer: J.Appell (Würzburg) MSC: 47J05 47H11 58E07 PDFBibTeX XMLCite \textit{J. Berkovits}, Bull. Soc. Math. Belg., Sér. B 44, No. 3, 237--247 (1992; Zbl 0783.47069)
Berkovits, J.; Mustonen, V. Topological degree for perturbations of linear maximal monotone mappings and applications to a class of parabolic problems. (English) Zbl 0806.47055 Rend. Mat. Appl., VII. Ser. 12, No. 3, 597-621 (1992). MSC: 47H11 47J05 35K30 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Rend. Mat. Appl., VII. Ser. 12, No. 3, 597--621 (1992; Zbl 0806.47055)
Berkovits, J.; Mustonen, V. Existence and multiplicity results for semilinear beam equations. (English) Zbl 0811.35014 Farkas, M. (ed.) et al., Differential equations and its applications. Proceedings of the colloquium on differential equations and applications, held in Budapest, August 21-24, 1991. Amsterdam: North-Holland Publishing Company. Colloq. Math. Soc. János Bolyai. 62, 49-63 (1991). Reviewer: R.Precup (Cluj-Napoca) MSC: 35G30 47H11 74K10 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, in: Differential equations and its applications. Proceedings of the colloquium on differential equations and applications, held in Budapest, August 21-24, 1991. Amsterdam: North-Holland Publishing Company. 49--63 (1991; Zbl 0811.35014)
Berkovits, Juha; Mustonen, Vesa On the existence of multiple solutions for semilinear equations with monotone nonlinearities crossing a finite number of eigenvalues. (English) Zbl 0757.35002 Nonlinear Anal., Theory Methods Appl. 17, No. 5, 399-412 (1991). Reviewer: L.Vazquez (Madrid) MSC: 35B10 35L70 35L05 35B45 35A99 47H11 55M25 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Nonlinear Anal., Theory Methods Appl. 17, No. 5, 399--412 (1991; Zbl 0757.35002) Full Text: DOI
Berkovits, Juha Topological degree and multiplication theorem for a class of nonlinear mappings. (English) Zbl 0745.47048 Bull. Lond. Math. Soc. 23, No. 6, 596-606 (1991). Reviewer: P.Zabreiko (Minsk) MSC: 47H11 47H30 PDFBibTeX XMLCite \textit{J. Berkovits}, Bull. Lond. Math. Soc. 23, No. 6, 596--606 (1991; Zbl 0745.47048) Full Text: DOI
Berkovits, Juha; Mustonen, Vesa An application of the topological degree theory for semilinear equations with strongly monotone nonlinearities. (English) Zbl 0762.35080 Bull. Lond. Math. Soc. 23, No. 5, 470-476 (1991). Reviewer: H.-D.Alber (Darmstadt) MSC: 35P30 55M25 47J05 47A75 PDFBibTeX XMLCite \textit{J. Berkovits} and \textit{V. Mustonen}, Bull. Lond. Math. Soc. 23, No. 5, 470--476 (1991; Zbl 0762.35080) Full Text: DOI
Berkovits, Juha; Mustonen, Vesa Some results on mappings of monotone type. (English) Zbl 0712.47048 Differential equations and applications, Proc. Int. Conf., Columbus/OH (USA) 1988, Vol. I, 61-68 (1989). MSC: 47H05 47F05 47J05 PDFBibTeX XML