## Wulbert, Daniel E.

Compute Distance To:
 Author ID: wulbert.daniel-e Published as: Wulbert, Daniel; Wulbert, D. E.; Wulbert, Daniel E.; Wulbert, D. more...less
 Documents Indexed: 49 Publications since 1967 Reviewing Activity: 151 Reviews Co-Authors: 11 Co-Authors with 13 Joint Publications 204 Co-Co-Authors
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### 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.
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### 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
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### 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)

### Citations contained in zbMATH Open

38 Publications have been cited 425 times in 344 Documents Cited by Year
The existence and unicity of best approximations. Zbl 0186.18701
Cheney, E. W.; Wulbert, D. E.
1969
Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0227.41009
Wulbert, Daniel
1971
On the classification of the Banach spaces whose duals are $$L_1$$ spaces. Zbl 0184.15102
Lindenstrauss, Joram; Wulbert, D. E.
1969
Continuity of the set-valued metric projection. Zbl 0189.42904
Blatter, J.; Morris, P. D.; Wulbert, D. E.
1968
On the minimal property of the Fourier projection. Zbl 0187.05603
Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E.
1969
Functional representation of topological algebras. Zbl 0163.36605
Morris, P. D.; Wulbert, D. E.
1967
Convergence of operators and Korovkin’s theorem. Zbl 0167.12904
Wulbert, D. E.
1968
Continuous selections for metric projections. Zbl 0174.17101
Lazar, A. J.; Wulbert, D. E.; Morris, P. D.
1969
Unique minimality of Fourier projections. Zbl 0545.42001
Fisher, S. D.; Morris, P. D.; Wulbert, D. E.
1981
Korovkin approximations in $$L_p$$ - spaces. Zbl 0329.41018
Kitto, W.; Wulbert, D. E.
1976
Some complemented function spaces in $$C(X)$$. Zbl 0157.44102
Wulbert, D. E.
1968
Continuity of metric projections. Zbl 0164.15003
Wulbert, D. E.
1968
A note on the characterization of conditional expectation operators. Zbl 0215.48704
Wulbert, D. E.
1970
Nonlinear approximation with tangential characterization. Zbl 0227.41010
Wulbert, Daniel E.
1971
On the characterization of complex rational approximations. Zbl 0435.30032
Wulbert, Daniel E.
1980
Favard’s inequality on average values of convex functions. Zbl 1081.90051
Wulbert, D. E.
2003
Averaging projections. Zbl 0179.18201
Wulbert, D. E.
1969
On the minimal property of the Fourier projection. Zbl 0187.05602
Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E.
1969
Liapanov’s and related theorems. Zbl 0714.28007
Wulbert, Daniel
1990
Contractive Korovkin approximations. Zbl 0303.41019
Wulbert, Daniel E.
1975
The rational approximation of real functions. Zbl 0399.41008
Wulbert, Daniel E.
1978
Subsets of first countable spaces. Zbl 0167.51101
Wulbert, D. E.
1968
Interpolation at a few points. Zbl 0938.41019
Wulbert, Daniel
1999
The topological spaces that support Haar systems. Zbl 0577.41023
McCullough, Scott; Wulbert, Daniel
1985
Annihilating a subspace of $$L_1$$ with the sign of a continuous function. Zbl 0958.46016
Wulbert, Daniel
2000
A characterization of $$C(X)$$ for locally connected $$X$$. Zbl 0174.25603
Wulbert, D. E.
1969
Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0206.07501
Wulbert, D.
1971
Corrigendum to ’The existence and unicity of best approximation’. Zbl 0216.39002
Cheney, E. W.; Wulbert, D. E.
1970
Representations of the spaces of Lipschitz functions. Zbl 0274.46022
Wulbert, Daniel E.
1974
Local best rational approximations to continuous functions and the rays they emanate. Zbl 0647.41017
Wulbert, Daniel
1988
Complex approximation of real functions by reciprocals of polynomials. Zbl 0683.41024
Wulbert, Daniel
1989
Oscillation spaces. Zbl 0749.41036
Wulbert, Daniel
1992
Lyapunov convexity without compactness. (Liapanouv convexity without compactness.) Zbl 1346.46037
Wulbert, Daniel
2010
The range of vector measures over topological sets and a unified Liapunov theorem. Zbl 0993.28004
Wulbert, Daniel
2001
A general Hobby-Rice theorem and cake cutting. Zbl 1005.41019
Wulbert, Daniel
2001
Real structure in complex $$L_1$$-preduals. Zbl 0369.46018
Wulbert, Daniel E.
1978
Approximation by $$C^k$$-functions. Zbl 0317.41035
Wulbert, Daniel
1973
An approximation proof in the theory of complex $$L_1$$-preduals. Zbl 0345.41023
Wulbert, Daniel
1976
Lyapunov convexity without compactness. (Liapanouv convexity without compactness.) Zbl 1346.46037
Wulbert, Daniel
2010
Favard’s inequality on average values of convex functions. Zbl 1081.90051
Wulbert, D. E.
2003
The range of vector measures over topological sets and a unified Liapunov theorem. Zbl 0993.28004
Wulbert, Daniel
2001
A general Hobby-Rice theorem and cake cutting. Zbl 1005.41019
Wulbert, Daniel
2001
Annihilating a subspace of $$L_1$$ with the sign of a continuous function. Zbl 0958.46016
Wulbert, Daniel
2000
Interpolation at a few points. Zbl 0938.41019
Wulbert, Daniel
1999
Oscillation spaces. Zbl 0749.41036
Wulbert, Daniel
1992
Liapanov’s and related theorems. Zbl 0714.28007
Wulbert, Daniel
1990
Complex approximation of real functions by reciprocals of polynomials. Zbl 0683.41024
Wulbert, Daniel
1989
Local best rational approximations to continuous functions and the rays they emanate. Zbl 0647.41017
Wulbert, Daniel
1988
The topological spaces that support Haar systems. Zbl 0577.41023
McCullough, Scott; Wulbert, Daniel
1985
Unique minimality of Fourier projections. Zbl 0545.42001
Fisher, S. D.; Morris, P. D.; Wulbert, D. E.
1981
On the characterization of complex rational approximations. Zbl 0435.30032
Wulbert, Daniel E.
1980
The rational approximation of real functions. Zbl 0399.41008
Wulbert, Daniel E.
1978
Real structure in complex $$L_1$$-preduals. Zbl 0369.46018
Wulbert, Daniel E.
1978
Korovkin approximations in $$L_p$$ - spaces. Zbl 0329.41018
Kitto, W.; Wulbert, D. E.
1976
An approximation proof in the theory of complex $$L_1$$-preduals. Zbl 0345.41023
Wulbert, Daniel
1976
Contractive Korovkin approximations. Zbl 0303.41019
Wulbert, Daniel E.
1975
Representations of the spaces of Lipschitz functions. Zbl 0274.46022
Wulbert, Daniel E.
1974
Approximation by $$C^k$$-functions. Zbl 0317.41035
Wulbert, Daniel
1973
Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0227.41009
Wulbert, Daniel
1971
Nonlinear approximation with tangential characterization. Zbl 0227.41010
Wulbert, Daniel E.
1971
Uniqueness and differential characterization of approximations from manifolds of functions. Zbl 0206.07501
Wulbert, D.
1971
A note on the characterization of conditional expectation operators. Zbl 0215.48704
Wulbert, D. E.
1970
Corrigendum to ’The existence and unicity of best approximation’. Zbl 0216.39002
Cheney, E. W.; Wulbert, D. E.
1970
The existence and unicity of best approximations. Zbl 0186.18701
Cheney, E. W.; Wulbert, D. E.
1969
On the classification of the Banach spaces whose duals are $$L_1$$ spaces. Zbl 0184.15102
Lindenstrauss, Joram; Wulbert, D. E.
1969
On the minimal property of the Fourier projection. Zbl 0187.05603
Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E.
1969
Continuous selections for metric projections. Zbl 0174.17101
Lazar, A. J.; Wulbert, D. E.; Morris, P. D.
1969
Averaging projections. Zbl 0179.18201
Wulbert, D. E.
1969
On the minimal property of the Fourier projection. Zbl 0187.05602
Cheney, E. W.; Hobby, C. R.; Morris, P. D.; Schurer, F.; Wulbert, D. E.
1969
A characterization of $$C(X)$$ for locally connected $$X$$. Zbl 0174.25603
Wulbert, D. E.
1969
Continuity of the set-valued metric projection. Zbl 0189.42904
Blatter, J.; Morris, P. D.; Wulbert, D. E.
1968
Convergence of operators and Korovkin’s theorem. Zbl 0167.12904
Wulbert, D. E.
1968
Some complemented function spaces in $$C(X)$$. Zbl 0157.44102
Wulbert, D. E.
1968
Continuity of metric projections. Zbl 0164.15003
Wulbert, D. E.
1968
Subsets of first countable spaces. Zbl 0167.51101
Wulbert, D. E.
1968
Functional representation of topological algebras. Zbl 0163.36605
Morris, P. D.; Wulbert, D. E.
1967
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### Cited by 292 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 Boccuto, Antonio 5 Borodin, Petr A. 5 Fischer, Thomas 5 Rao, T. S. S. R. K. 5 Shekhtman, Boris 4 Alimov, Alexey R. 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 Bardaro, Carlo 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 Mantellini, Ilaria 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 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 Mallios, Anastasios 2 Mason, John C. 2 Min’kova, R. M. 2 Mohebi, Hossein 2 Narang, Tulsi Das 2 Odinets, Vladimir Petrovich 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. ...and 192 more Authors
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### Cited in 87 Serials

 93 Journal of Approximation Theory 18 Journal of Functional Analysis 16 Mathematical Notes 15 Proceedings of the American Mathematical Society 13 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 3 Positivity 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 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 Tôhoku 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 Sbornik: Mathematics 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 Hacettepe Journal of Mathematics and Statistics 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 1 Constructive Mathematical Analysis
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### Cited in 33 Fields

 199 Approximations and expansions (41-XX) 151 Functional analysis (46-XX) 42 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) 8 Sequences, series, summability (40-XX) 8 Convex and discrete geometry (52-XX) 7 Abstract harmonic analysis (43-XX) 6 Functions of a complex variable (30-XX) 6 Probability theory and stochastic processes (60-XX) 5 Order, lattices, ordered algebraic structures (06-XX) 4 Linear and multilinear algebra; matrix theory (15-XX) 4 Calculus of variations and optimal control; optimization (49-XX) 4 Operations research, mathematical programming (90-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)