Edit Profile Wulbert, Daniel E. Compute Distance To: Compute Author ID: wulbert.daniel-e Published as: Wulbert, Daniel; Wulbert, D. E.; Wulbert, Daniel E.; Wulbert, D. Documents Indexed: 49 Publications since 1967 Reviewing Activity: 148 Reviews all top 5 Co-Authors 36 single-authored 6 Morris, Peter D. 4 Cheney, Elliott Ward jun. 2 Hobby, Charles R. 1 Blatter, Jörg 1 Fisher, Stephen D. 1 George, Shiju 1 Kitto, Wei Z. 1 Lazar, Aldo J. 1 Lindenstrauss, Joram 1 McCullough, Scott A. 1 Pinkus, Allan M. all top 5 Serials 6 Journal of Approximation Theory 6 Journal of Functional Analysis 5 Proceedings of the American Mathematical Society 5 Transactions of the American Mathematical Society 4 Pacific Journal of Mathematics 3 American Journal of Mathematics 2 Illinois Journal of Mathematics 2 Mathematica Scandinavica 2 Bulletin of the American Mathematical Society 1 Israel Journal of Mathematics 1 Journal of Mathematical Analysis and Applications 1 Mathematische Annalen 1 The Mathematics Student 1 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 1 Numerische Mathematik 1 Advances in Applied Mathematics 1 Mathematical and Computer Modelling all top 5 Fields 21 Approximations and expansions (41-XX) 10 Functional analysis (46-XX) 3 Measure and integration (28-XX) 2 Real functions (26-XX) 2 Operator theory (47-XX) 2 General topology (54-XX) 2 Numerical analysis (65-XX) 1 Order, lattices, ordered algebraic structures (06-XX) 1 Functions of a complex variable (30-XX) 1 Harmonic analysis on Euclidean spaces (42-XX) 1 Global analysis, analysis on manifolds (58-XX) 1 Operations research, mathematical programming (90-XX) 1 Information and communication theory, circuits (94-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 38 Publications have been cited 420 times in 339 Documents Cited by ▼ Year ▼ The existence and unicity of best approximations. Zbl 0186.18701Cheney, E. W.; Wulbert, D. E. 45 1969 Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0227.41009Wulbert, Daniel 45 1971 On the classification of the Banach spaces whose duals are \(L_1\) spaces. Zbl 0184.15102Lindenstrauss, Joram; Wulbert, D. E. 40 1969 Continuity of the set-valued metric projection. Zbl 0189.42904Blatter, J.; Morris, P. D.; Wulbert, D. E. 39 1968 Functional representation of topological algebras. Zbl 0163.36605Morris, P. D.; Wulbert, D. E. 29 1967 Convergence of operators and Korovkin’s theorem. Zbl 0167.12904Wulbert, D. E. 29 1968 On the minimal property of the Fourier projection. Zbl 0187.05603Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E. 29 1969 Continuous selections for metric projections. Zbl 0174.17101Lazar, A. J.; Wulbert, D. E.; Morris, P. D. 26 1969 Unique minimality of Fourier projections. Zbl 0545.42001Fisher, S. D.; Morris, P. D.; Wulbert, D. E. 17 1981 Korovkin approximations in \(L_p\) - spaces. Zbl 0329.41018Kitto, W.; Wulbert, D. E. 14 1976 Some complemented function spaces in \(C(X)\). Zbl 0157.44102Wulbert, D. E. 11 1968 Continuity of metric projections. Zbl 0164.15003Wulbert, D. E. 10 1968 A note on the characterization of conditional expectation operators. Zbl 0215.48704Wulbert, D. E. 10 1970 Nonlinear approximation with tangential characterization. Zbl 0227.41010Wulbert, Daniel E. 8 1971 On the characterization of complex rational approximations. Zbl 0435.30032Wulbert, Daniel E. 7 1980 Favard’s inequality on average values of convex functions. Zbl 1081.90051Wulbert, D. E. 6 2003 Averaging projections. Zbl 0179.18201Wulbert, D. E. 6 1969 On the minimal property of the Fourier projection. Zbl 0187.05602Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E. 6 1969 Contractive Korovkin approximations. Zbl 0303.41019Wulbert, Daniel E. 5 1975 Liapanov’s and related theorems. Zbl 0714.28007Wulbert, Daniel 5 1990 The rational approximation of real functions. Zbl 0399.41008Wulbert, Daniel E. 4 1978 Subsets of first countable spaces. Zbl 0167.51101Wulbert, D. E. 4 1968 The topological spaces that support Haar systems. Zbl 0577.41023McCullough, Scott; Wulbert, Daniel 3 1985 Interpolation at a few points. Zbl 0938.41019Wulbert, Daniel 3 1999 Annihilating a subspace of \(L_1\) with the sign of a continuous function. Zbl 0958.46016Wulbert, Daniel 2 2000 Representations of the spaces of Lipschitz functions. Zbl 0274.46022Wulbert, Daniel E. 2 1974 A characterization of \(C(X)\) for locally connected \(X\). Zbl 0174.25603Wulbert, D. E. 2 1969 Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0206.07501Wulbert, D. 2 1971 Corrigendum to ’The existence and unicity of best approximation’. Zbl 0216.39002Cheney, E. W.; Wulbert, D. E. 2 1970 Approximation by \(C^k\)-functions. Zbl 0317.41035Wulbert, Daniel 1 1973 An approximation proof in the theory of complex \(L_1\)-preduals. Zbl 0345.41023Wulbert, Daniel 1 1976 Oscillation spaces. Zbl 0749.41036Wulbert, Daniel 1 1992 Real structure in complex \(L_1\)-preduals. Zbl 0369.46018Wulbert, Daniel E. 1 1978 Lyapunov convexity without compactness. (Liapanouv convexity without compactness.) Zbl 1346.46037Wulbert, Daniel 1 2010 Local best rational approximations to continuous functions and the rays they emanate. Zbl 0647.41017Wulbert, Daniel 1 1988 Complex approximation of real functions by reciprocals of polynomials. Zbl 0683.41024Wulbert, Daniel 1 1989 A general Hobby-Rice theorem and cake cutting. Zbl 1005.41019Wulbert, Daniel 1 2001 The range of vector measures over topological sets and a unified Liapunov theorem. Zbl 0993.28004Wulbert, Daniel 1 2001 Lyapunov convexity without compactness. (Liapanouv convexity without compactness.) Zbl 1346.46037Wulbert, Daniel 1 2010 Favard’s inequality on average values of convex functions. Zbl 1081.90051Wulbert, D. E. 6 2003 A general Hobby-Rice theorem and cake cutting. Zbl 1005.41019Wulbert, Daniel 1 2001 The range of vector measures over topological sets and a unified Liapunov theorem. Zbl 0993.28004Wulbert, Daniel 1 2001 Annihilating a subspace of \(L_1\) with the sign of a continuous function. Zbl 0958.46016Wulbert, Daniel 2 2000 Interpolation at a few points. Zbl 0938.41019Wulbert, Daniel 3 1999 Oscillation spaces. Zbl 0749.41036Wulbert, Daniel 1 1992 Liapanov’s and related theorems. Zbl 0714.28007Wulbert, Daniel 5 1990 Complex approximation of real functions by reciprocals of polynomials. Zbl 0683.41024Wulbert, Daniel 1 1989 Local best rational approximations to continuous functions and the rays they emanate. Zbl 0647.41017Wulbert, Daniel 1 1988 The topological spaces that support Haar systems. Zbl 0577.41023McCullough, Scott; Wulbert, Daniel 3 1985 Unique minimality of Fourier projections. Zbl 0545.42001Fisher, S. D.; Morris, P. D.; Wulbert, D. E. 17 1981 On the characterization of complex rational approximations. Zbl 0435.30032Wulbert, Daniel E. 7 1980 The rational approximation of real functions. Zbl 0399.41008Wulbert, Daniel E. 4 1978 Real structure in complex \(L_1\)-preduals. Zbl 0369.46018Wulbert, Daniel E. 1 1978 Korovkin approximations in \(L_p\) - spaces. Zbl 0329.41018Kitto, W.; Wulbert, D. E. 14 1976 An approximation proof in the theory of complex \(L_1\)-preduals. Zbl 0345.41023Wulbert, Daniel 1 1976 Contractive Korovkin approximations. Zbl 0303.41019Wulbert, Daniel E. 5 1975 Representations of the spaces of Lipschitz functions. Zbl 0274.46022Wulbert, Daniel E. 2 1974 Approximation by \(C^k\)-functions. Zbl 0317.41035Wulbert, Daniel 1 1973 Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0227.41009Wulbert, Daniel 45 1971 Nonlinear approximation with tangential characterization. Zbl 0227.41010Wulbert, Daniel E. 8 1971 Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0206.07501Wulbert, D. 2 1971 A note on the characterization of conditional expectation operators. Zbl 0215.48704Wulbert, D. E. 10 1970 Corrigendum to ’The existence and unicity of best approximation’. Zbl 0216.39002Cheney, E. W.; Wulbert, D. E. 2 1970 The existence and unicity of best approximations. Zbl 0186.18701Cheney, E. W.; Wulbert, D. E. 45 1969 On the classification of the Banach spaces whose duals are \(L_1\) spaces. Zbl 0184.15102Lindenstrauss, Joram; Wulbert, D. E. 40 1969 On the minimal property of the Fourier projection. Zbl 0187.05603Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E. 29 1969 Continuous selections for metric projections. Zbl 0174.17101Lazar, A. J.; Wulbert, D. E.; Morris, P. D. 26 1969 Averaging projections. Zbl 0179.18201Wulbert, D. E. 6 1969 On the minimal property of the Fourier projection. Zbl 0187.05602Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E. 6 1969 A characterization of \(C(X)\) for locally connected \(X\). Zbl 0174.25603Wulbert, D. E. 2 1969 Continuity of the set-valued metric projection. Zbl 0189.42904Blatter, J.; Morris, P. D.; Wulbert, D. E. 39 1968 Convergence of operators and Korovkin’s theorem. Zbl 0167.12904Wulbert, D. E. 29 1968 Some complemented function spaces in \(C(X)\). Zbl 0157.44102Wulbert, D. E. 11 1968 Continuity of metric projections. Zbl 0164.15003Wulbert, D. E. 10 1968 Subsets of first countable spaces. Zbl 0167.51101Wulbert, D. E. 4 1968 Functional representation of topological algebras. Zbl 0163.36605Morris, P. D.; Wulbert, D. E. 29 1967 all cited Publications top 5 cited Publications all top 5 Cited by 282 Authors 16 Wulbert, Daniel E. 12 Nürnberger, Günther 10 Deutsch, Frank 9 Lewicki, Grzegorz 8 Skrzypek, Lesław 6 Brosowski, Bruno 6 Kąkol, Jerzy 6 Li, Wu 6 Saxon, Stephen A. 6 Sommer, Manfred 5 Borodin, Petr A. 5 Fischer, Thomas 5 Rao, T. S. S. R. K. 5 Shekhtman, Boris 4 Alimov, Alexey R. 4 Boccuto, Antonio 4 Braess, Dietrich 4 Brown, Aldric L. 4 Gabriyelyan, Saak S. 4 Lambert, Joseph M. 4 Morris, Peter D. 4 Smarzewski, Ryszard 4 Todd, Aaron R. 3 Arhippainen, Jorma 3 Bartelt, Martin W. 3 Benyamini, Yoav 3 Berens, Hubert Anton 3 Blatter, Jörg 3 Demirci, Kamil 3 Dhombres, Jean G. 3 Donner, Klaus 3 Foucart, Simon 3 Gasparis, Ioannis 3 Godini, Gliceria 3 Kusraev, Anatoly Georgievich 3 Lazar, Aldo J. 3 Lin, Pei-Kee 3 Lindenstrauss, Joram 3 Park, Sung Ho 3 Pečarić, Josip 3 Pinkus, Allan M. 3 Prophet, Michael P. 3 Requejo, Batildo 3 Schmidt, Darrell 2 Amir, Dan 2 Angelos, James R. 2 Bardaro, Carlo 2 Bauer, Heinz 2 Castejón, Alberto 2 Cheney, Elliott Ward jun. 2 Cromme, Ludwig J. 2 Deregowska, Beata 2 Dinculeanu, Nicolae 2 Dreseler, Bernd 2 Druzhinin, Yu. Yu. 2 Effros, Edward George 2 Fakhoury, Hicham 2 Flösser, Hans-Otto 2 Helton, John William 2 Huotari, Robert 2 Husain, Taqdir 2 Indumathi, V. 2 James, Ralph L. 2 Kozdęba, Michał 2 Kutateladze, Semën Samsonovich 2 Lacey, H. Elton 2 Lau, Anthony To-Ming 2 Lewandowska, Barbara 2 Light, William A. 2 Lima, Asvald 2 López Pellicer, Manuel 2 Lorentz, Georg Gunther 2 Ludvík, Pavel 2 Lusky, Wolfgang 2 Mach, Jaroslav 2 Mah, Peter F. 2 Mantellini, Ilaria 2 Mason, John C. 2 Min’kova, R. M. 2 Mohebi, Hossein 2 Narang, Tulsi Das 2 Orhan, Sevda 2 Papini, Pier Luigi 2 Peherstorfer, Franz 2 Perić, Ivan 2 Pulgarín, Antonio A. 2 Rao, Malempati M. 2 Render, Hermann 2 Roy, Nina M. 2 Ruttan, Arden 2 Scheffold, Egon 2 Schempp, Walter Johannes 2 Schumacher, Robert T. 2 Singer, Ivan 2 Smith, Philip W. 2 Spurný, Jiří 2 Strauss, Hans 2 Todorcevic, Stevo B. 2 Tsar’kov, Igor’ Germanovich 2 Vlasov, L. P. ...and 182 more Authors all top 5 Cited in 84 Serials 93 Journal of Approximation Theory 18 Journal of Functional Analysis 16 Mathematical Notes 15 Proceedings of the American Mathematical Society 12 Israel Journal of Mathematics 11 Journal of Mathematical Analysis and Applications 11 Numerical Functional Analysis and Optimization 10 Mathematische Zeitschrift 10 Transactions of the American Mathematical Society 7 Topology and its Applications 7 Constructive Approximation 6 Mathematische Annalen 6 Numerische Mathematik 4 Rocky Mountain Journal of Mathematics 4 Archiv der Mathematik 4 Monatshefte für Mathematik 4 Bulletin of the American Mathematical Society 4 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 3 Periodica Mathematica Hungarica 3 Advances in Mathematics 3 Computing 3 Czechoslovak Mathematical Journal 3 Journal of Soviet Mathematics 3 Results in Mathematics 3 Siberian Mathematical Journal 2 Analysis Mathematica 2 Bulletin of the Australian Mathematical Society 2 Computers & Mathematics with Applications 2 Annales de l’Institut Fourier 2 Journal of Multivariate Analysis 2 Manuscripta Mathematica 2 Mathematical and Computer Modelling 2 Aequationes Mathematicae 2 Journal of Mathematical Sciences (New York) 2 Positivity 2 Acta Mathematica Sinica. English Series 2 Analysis in Theory and Applications 2 Mediterranean Journal of Mathematics 2 Bulletin de la Société Mathématique de France. Supplément. Mémoires 1 Acta Mathematica Academiae Scientiarum Hungaricae 1 Journal d’Analyse Mathématique 1 Moscow University Mathematics Bulletin 1 Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM) 1 Arkiv för Matematik 1 Mathematics of Computation 1 Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg 1 Acta Mathematica 1 Geometriae Dedicata 1 Glasgow Mathematical Journal 1 Illinois Journal of Mathematics 1 Journal of Optimization Theory and Applications 1 Mathematische Nachrichten 1 Mathematika 1 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 1 Proceedings of the Edinburgh Mathematical Society. Series II 1 Rendiconti del Circolo Matemàtico di Palermo. Serie II 1 Tohoku Mathematical Journal. Second Series 1 Advances in Applied Mathematics 1 Systems & Control Letters 1 Applied Mathematics and Mechanics. (English Edition) 1 Acta Mathematica Hungarica 1 SIAM Journal on Matrix Analysis and Applications 1 Bulletin of the American Mathematical Society. New Series 1 Proceedings of the Indian Academy of Sciences. Mathematical Sciences 1 Journal of Applied Analysis 1 Abstract and Applied Analysis 1 Journal of Inequalities and Applications 1 Revista Matemática Complutense 1 Bulletin of the Malaysian Mathematical Sciences Society. Second Series 1 Missouri Journal of Mathematical Sciences 1 Vladikavkazskiĭ Matematicheskiĭ Zhurnal 1 Journal of Function Spaces and Applications 1 Proceedings of the Japan Academy 1 Proceedings of the Steklov Institute of Mathematics 1 Mathematics and Financial Economics 1 Applicable Analysis and Discrete Mathematics 1 Journal of Applied and Industrial Mathematics 1 Banach Journal of Mathematical Analysis 1 Set-Valued and Variational Analysis 1 Eurasian Mathematical Journal 1 Iranian Journal of Mathematical Sciences and Informatics 1 Journal of Function Spaces 1 Nonlinear Analysis. Theory, Methods & Applications 1 Bollettino dell’Unione Matematica Italiana all top 5 Cited in 33 Fields 196 Approximations and expansions (41-XX) 146 Functional analysis (46-XX) 40 Operator theory (47-XX) 22 General topology (54-XX) 14 Real functions (26-XX) 12 Numerical analysis (65-XX) 11 Harmonic analysis on Euclidean spaces (42-XX) 8 Mathematical logic and foundations (03-XX) 8 Measure and integration (28-XX) 7 Sequences, series, summability (40-XX) 7 Abstract harmonic analysis (43-XX) 7 Convex and discrete geometry (52-XX) 6 Order, lattices, ordered algebraic structures (06-XX) 6 Functions of a complex variable (30-XX) 6 Probability theory and stochastic processes (60-XX) 4 Calculus of variations and optimal control; optimization (49-XX) 4 Operations research, mathematical programming (90-XX) 3 Linear and multilinear algebra; matrix theory (15-XX) 3 Nonassociative rings and algebras (17-XX) 3 Topological groups, Lie groups (22-XX) 3 Difference and functional equations (39-XX) 3 Differential geometry (53-XX) 2 Partial differential equations (35-XX) 2 Global analysis, analysis on manifolds (58-XX) 1 Combinatorics (05-XX) 1 Number theory (11-XX) 1 Potential theory (31-XX) 1 Several complex variables and analytic spaces (32-XX) 1 Special functions (33-XX) 1 Integral transforms, operational calculus (44-XX) 1 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 1 Systems theory; control (93-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year