Edit Profile (opens in new tab) Willem, Michel Compute Distance To: Compute Author ID: willem.michel Published as: Willem, Michel; Willem, M.; Willem, Michael External Links: MGP · Wikidata · IdRef Documents Indexed: 142 Publications since 1978, including 15 Books 1 Contribution as Editor Co-Authors: 47 Co-Authors with 104 Joint Publications 1,006 Co-Co-Authors all top 5 Co-Authors 39 single-authored 19 Mawhin, Jean L. 10 Bartsch, Thomas J. 9 Fournier, Gilles 9 Wang, Zhi-Qiang 7 Szulkin, Andrzej 6 Li, Shujie 6 Troestler, Christophe 5 Smets, Didier 4 Chabrowski, Jan H. 3 Costa, David Goldstein 3 Ding, Yanheng 3 Fonda, Alessandro 3 Ramos, Miguel 3 Roselli, Paolo 3 Su, Jiabao 3 Van Schaftingen, Jean 3 Weth, Tobias 2 De Coster, Colette 2 De Valeriola, Sébastien 2 Mercuri, Carlo 2 Munyamarere, François 2 Nkashama, Mubenga N. 2 Rădulescu, Vicenţiu D. 2 Timoumi, Mohsen 2 Ward, James Robert jun. 1 Bonheure, Denis 1 Bouchez, Vincent 1 Brézis, Haïm 1 Brock, Friedemann 1 Čaklović, Lavoslav 1 Cuesta, Mabel 1 Farina, Alberto 1 Goeleven, Daniel 1 Hupperts, Yves 1 Lami Dozo, Enrique J. 1 Luan, Shixia 1 Lupo, Daniela 1 Martinez-Amores, Pedro 1 Nguyen, Van Hien 1 Omana, Walo 1 Ortega, Rafael 1 Ruiz, David 1 Secchi, Simone 1 Sintzoff, Paul 1 Takáč, Peter 1 Tshinanga, S. B. 1 Zou, Wenming all top 5 Serials 12 Rapport. Séminaire de Mathématique. Nouvelle Série 9 Journal of Differential Equations 6 Topological Methods in Nonlinear Analysis 5 Journal of Functional Analysis 5 Proceedings of the American Mathematical Society 5 Nonlinear Analysis. Theory, Methods & Applications 4 Differential and Integral Equations 4 Calculus of Variations and Partial Differential Equations 4 Communications in Contemporary Mathematics 3 Journal d’Analyse Mathématique 3 Journal of Mathematical Analysis and Applications 2 Archive for Rational Mechanics and Analysis 2 Bulletin of the Australian Mathematical Society 2 Bulletin de la Société Matheḿatique de Belgique. Série B 2 Annales de l’Institut Henri Poincaré. Analyse Non Linéaire 2 Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences, Série A 2 Journal of Fixed Point Theory and Applications 1 American Mathematical Monthly 1 Jahresbericht der Deutschen Mathematiker-Vereinigung (DMV) 1 Revue des Questions Scientifiques, 5. Série 1 Studia Mathematica 1 ZAMP. Zeitschrift für angewandte Mathematik und Physik 1 Annales des Sciences Mathématiques du Québec 1 Indiana University Mathematics Journal 1 Journal of Computational and Applied Mathematics 1 Journal für die Reine und Angewandte Mathematik 1 Rendiconti dell’Istituto di Matematica dell’Università di Trieste 1 Rivista di Matematica della Università di Parma. Serie IV 1 Zeitschrift für Analysis und ihre Anwendungen 1 Bollettino della Unione Matemàtica Italiana. Serie VI. C. Analisi Funzionale e Applicazioni 1 Communications in Partial Differential Equations 1 SIAM Journal on Mathematical Analysis 1 Bulletin de la Société Mathématique de Belgique. Série A 1 Comptes Rendus de l’Académie des Sciences. Série I 1 Bollettino della Unione Matemàtica Italiana. Serie VI. B 1 Bollettino della Unione Matemàtica Italiana. Serie VII. B 1 Bulletin of the Belgian Mathematical Society - Simon Stevin 1 NoDEA. Nonlinear Differential Equations and Applications 1 Discrete and Continuous Dynamical Systems 1 Journal of the European Mathematical Society (JEMS) 1 Portugaliae Mathematica. Nova Série 1 Advanced Nonlinear Studies 1 Comptes Rendus. Mathématique. Académie des Sciences, Paris 1 Boundary Value Problems 1 Bollettino della Unione Matematica Italiana. Series V. A 1 Applied Mathematical Sciences 1 Contemporary Mathematics 1 Enseignement des Mathématiques (Cassini) 1 Nouvelle Bibliothèque Mathématique 1 Pure and Applied Functional Analysis 1 Progress in Nonlinear Differential Equations and Their Applications 1 Cornerstones 1 L’Academie en Poche all top 5 Fields 75 Partial differential equations (35-XX) 45 Global analysis, analysis on manifolds (58-XX) 28 Operator theory (47-XX) 25 Ordinary differential equations (34-XX) 18 Calculus of variations and optimal control; optimization (49-XX) 14 Dynamical systems and ergodic theory (37-XX) 12 Real functions (26-XX) 8 Mechanics of particles and systems (70-XX) 7 Functional analysis (46-XX) 4 History and biography (01-XX) 3 General and overarching topics; collections (00-XX) 3 Integral equations (45-XX) 3 Algebraic topology (55-XX) 2 Measure and integration (28-XX) 2 Quantum theory (81-XX) 1 Potential theory (31-XX) 1 Special functions (33-XX) 1 Harmonic analysis on Euclidean spaces (42-XX) 1 Abstract harmonic analysis (43-XX) 1 Differential geometry (53-XX) 1 Numerical analysis (65-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 113 Publications have been cited 5,102 times in 3,928 Documents Cited by ▼ Year ▼ Minimax theorems. Zbl 0856.49001Willem, Michel 1,401 1996 Critical point theory and Hamiltonian systems. Zbl 0676.58017Mawhin, Jean; Willem, Michel 1,085 1989 Homoclinic orbits for a class of Hamiltonian systems. Zbl 0759.58018Omana, W.; Willem, M. 156 1992 On an elliptic equation with concave and convex nonlinearities. Zbl 0848.35039Bartsch, Thomas; Willem, Michel 127 1995 Partial symmetry of least energy nodal solutions to some variational problems. Zbl 1206.35086Bartsch, Thomas; Weth, Tobias; Willem, Michel 125 2005 Applications of local linking to critical point theory. Zbl 0820.58012Li, Shujie; Willem, Michel 125 1995 Non-radial ground states for the Hénon equation. Zbl 1160.35415Smets, Didier; Willem, Michel; Su, Jiabao 121 2002 Infinitely many radial solutions of a semilinear elliptic problem on \(\mathbb{R}^ N\). Zbl 0790.35020Bartsch, Thomas; Willem, Michel 108 1993 Weighted Sobolev embedding with unbounded and decaying radial potentials. Zbl 1220.35026Su, Jiabao; Wang, Zhi-Qiang; Willem, Michel 92 2007 Infinitely many nonradial solutions of a Euclidean scalar field equation. Zbl 0790.35021Bartsch, Thomas; Willem, Michel 90 1993 Partial symmetry and asymptotic behavior for some elliptic variational problems. Zbl 1274.35026Smets, Didier; Willem, Michel 86 2003 Solitary waves with prescribed speed on infinite lattices. Zbl 0889.34059Smets, D.; Willem, M. 79 1997 Nonlinear Schrödinger equations with unbounded and decaying radial potentials. Zbl 1141.35056Su, Jiabao; Wang, Zhi-Qiang; Willem, Michel 74 2007 Multiple solutions of the periodic boundary value problem for some forced pendulum-type equations. Zbl 0557.34036Mawhin, J.; Willem, M. 73 1984 On a Schrödinger equation with periodic potential and spectrum point zero. Zbl 1030.35068Willem, Michel; Zou, Wenming 73 2003 Nontrivial solution of a semilinear Schrödinger equation. Zbl 0864.35036Troestler, C.; Willem, M. 67 1996 Extrema problems with critical Sobolev exponents on unbounded domains. Zbl 0851.49004Ben-Naoum, A. K.; Troestler, C.; Willem, M. 64 1996 Elliptic problems with critical exponents and Hardy potentials. Zbl 1163.35383Ruiz, D.; Willem, M. 60 2003 Critical points of convex perturbations of some indefinite quadratic forms and semilinear boundary value problems at resonance. Zbl 0678.35091Mawhin, J.; Willem, M. 49 1986 Singular minimization problems. Zbl 0954.35074Wang, Z.-Q.; Willem, M. 47 2000 Variational methods and semilinear elliptic equations. Zbl 0656.35044Mawhin, J.; Ward, J. R. jun.; Willem, M. 45 1986 Functional analysis. Fundamentals and applications. Zbl 1284.46001Willem, Michel 43 2013 Eigenvalue problems with indefinite weight. Zbl 0931.35121Szulkin, Andrzej; Willem, Michel 42 1999 Caffarelli–Kohn–Nirenberg inequalities with remainder terms. Zbl 1037.26014Wang, Zhi-Qiang; Willem, Michel 42 2003 A Sobolev inequality with remainder term and critical equations on domains with topology for the polyharmonic operator. Zbl 1059.31006Bartsch, Thomas; Weth, Tobias; Willem, Michel 42 2003 Homoclinic orbits of a Hamiltonian system. Zbl 0997.37041Ding, Yanheng; Willem, Michel 41 1999 A global compactness result for the \(p\)-Laplacian involving critical nonlinearities. Zbl 1193.35051Mercuri, Carlo; Willem, Michel 37 2010 The Dirichlet problem for superlinear elliptic equations. Zbl 1207.35001Bartsch, Thomas; Wang, Zhi-Qiang; Willem, Michael 37 2005 Remarks on a Hardy-Sobolev inequality. Zbl 1035.35020Secchi, Simone; Smets, Didier; Willem, Michel 32 2003 Oscillations forcees de systèmes hamiltoniens. Zbl 0482.70020Willem, Michel 28 1981 Limit relative category and critical point theory. Zbl 0794.58007Fournier, G.; Lupo, D.; Ramos, M.; Willem, M. 25 1994 Partial symmetry of vector solutions for elliptic systems. Zbl 1298.35206Wang, Zhi-Qiang; Willem, Michel 24 2014 Multiple solutions of the forced double pendulum equation. Zbl 0683.70022Fournier, G.; Willem, M. 24 1989 Symmetry of solutions of semilinear elliptic problems. Zbl 1148.35025Van Schaftingen, Jean; Willem, Michel 23 2008 Multiple solutions for asymptotically linear boundary value problems in which the nonlinearity crosses at least one eigenvalue. Zbl 0933.35066Li, Shujie; Willem, Michel 22 1998 Necessary and sufficient conditions for the solvability of a nonlinear two-point boundary value problem. Zbl 0559.34014Mawhin, J.; Ward, J. R.; Willem, M. 21 1985 Existence and multiplicity results for homogeneous second order differential equations. Zbl 0808.58013Ben Naoum, A. K.; Troestler, C.; Willem, M. 20 1994 Subharmonic oscillations of convex Hamiltonian systems. Zbl 0579.34030Willem, M. 19 1985 Positive solutions for elliptic equations with critical growth in unbounded domains. Zbl 0968.35050Ramos, M.; Wang, Z.-Q.; Willem, M. 19 2000 Subharmonic oscillations of forced pendulum-type equations. Zbl 0708.34028Fonda, A.; Willem, M. 18 1989 Least energy solutions of a critical Neumann problem with a weight. Zbl 1221.35116Chabrowski, J.; Willem, M. 18 2002 Set transformations, symmetrizations and isoperimetric inequalities. Zbl 1453.26034Van Schaftingen, J.; Willem, M. 18 2004 Relative category and the calculus of variations. Zbl 0719.58010Fournier, G.; Willem, M. 17 1990 Periodic solutions of non-autonomous Hamiltonian systems with symmetries. Zbl 0794.58037Bartsch, Th.; Willem, M. 17 1994 A note on Palais-Smale condition and coercivity. Zbl 0782.58019Caklovic, L.; Li, Shujie; Willem, M. 16 1990 Real harmonic analysis. (Analyse harmonique réelle.) Zbl 0839.43001Willem, Michel 16 1995 Solutions of a system of diffusion equations. Zbl 1134.35094Ding, Yanheng; Luan, Shixia; Willem, Michel 15 2007 Subharmonic solutions for second order differential equations. Zbl 0803.34029Fonda, A.; Ramos, M.; Willem, M. 14 1993 Origin and evolution of the Palais-Smale condition in critical point theory. Zbl 1205.58009Mawhin, Jean; Willem, Michel 12 2010 Ground state solutions for a semilinear problem with critical exponent. Zbl 1240.35205Szulkin, Andrzej; Weth, Tobias; Willem, Michel 12 2009 Periodic solutions of symmetric wave equations. Zbl 0909.35092Ding, Yanheng; Li, Shujie; Willem, Michel 12 1998 Periodic oscillations of odd second order Hamiltonian systems. Zbl 0582.58014Willem, Michel 11 1984 Existence of many positive solutions of semilinear elliptic equations on an annulus. Zbl 0911.35051Wang, Zhi-Qiang; Willem, Michel 10 1999 Generic results for the existence of nondegenerate periodic solutions of some differential systems with periodic nonlinearities. Zbl 0742.34043Martinez-Amores, P.; Mawhin, J.; Ortega, R.; Willem, M. 9 1991 On some quasilinear critical problems. Zbl 1182.35090De Valeriola, Sébastien; Willem, Michel 9 2009 Elementary functional analysis. (Analyse fonctionnelle élémentaire.) Zbl 1089.46001Willem, Michel 9 2003 Subharmonic oscillations of a semilinear wave equation. Zbl 0588.35054Willem, Michel 8 1985 Multiple critical points of invariant functionals and applications. Zbl 0628.35037Costa, D. G.; Willem, M. 8 1986 Principles of functional analysis. (Principes d’analyse fonctionnelle.) Zbl 1205.46001Willem, Michel 8 2007 Density of the range of potential operators. Zbl 0478.49012Willem, Michel 8 1981 A semilinear elliptic equation on \(\mathbb R^N\) with unbounded coefficients. Zbl 1094.35054Sintzoff, P.; Willem, M. 8 2002 Hardy-Sobolev inequalities with remainder terms. Zbl 1033.35044Rădulescu, Vicenţiu; Smets, Didier; Willem, Michel 8 2002 Morse theory and nonlinear differential equations. Zbl 1236.58023Bartsch, Thomas; Szulkin, Andrzej; Willem, Michel 7 2008 A multiplicity result for the generalized Kadomtsev-Petviashvili equation. Zbl 0902.35100Wang, Z.-Q.; Willem, M. 7 1996 Bifurcation, symmetry and Morse theory. Zbl 0676.58020Willem, Michel 6 1989 Least energy nodal solutions of the Brezis-Nirenberg problem in dimension \(N=5\). Zbl 1178.35175Roselli, Paolo; Willem, Michel 6 2009 Remarks on the dual least action principle. Zbl 0528.58006Willem, M. 5 1982 Lectures on critical point theory. (Given at the University of Brasilia in January and February 1983). Zbl 0541.58016Willem, Michel 5 1983 Periodic solutions of wave equations with jumping nonlinearities. Zbl 0429.35049Willem, Michel 5 1980 A decomposition lemma and critical minimization problems. Zbl 1194.35122Willem, Michel 5 2003 Points critiques multiples de fonctionnelles invariantes. (Multiple critical points of invariant functionals). Zbl 0581.58010Costa, David; Willem, Michel 4 1984 Schrödinger equation with multiparticle potential and critical nonlinearity. Zbl 1195.35145Chabrowski, Jan; Szulkin, Andrzej; Willem, Michel 4 2009 A Liouville theorem for the \(p\)-Laplacian and related questions. Zbl 1421.35170Farina, Alberto; Mercuri, Carlo; Willem, Michel 4 2019 Densité de l’image de la différence de deux opérateurs. Zbl 0436.47051Willem, Michel 4 1980 Topology and semilinear equations at resonance in Hilbert space. Zbl 0472.47036Willem, Michel 4 1981 Existence and multiplicity results for semicoercive unilateral problems. Zbl 0808.58015Goeleven, D.; Nguyen, V. H.; Willem, M. 4 1994 Some critical minimization problems for functions of bounded variations. Zbl 1201.49006Bartsch, Thomas; Willem, Michel 4 2010 Lusternik-Schnirelman theory and asymptotically linear Hamiltonian systems. Zbl 0622.34044Costa, D.; Willem, M. 3 1987 Time-periodic solutions of boundary value problems for nonlinear heat, telegraph and beam equations. Zbl 0622.35004Nkashama, M. N.; Willem, M. 3 1987 Variational methods and boundary value problems for vector second order differential equations and applications to the pendulum equation. Zbl 0563.34048Mawhin, J.; Willem, M. 3 1984 Extremal functions for the Caffarelli-Kohn-Nirenberg inequalities: A simple proof of the symmetry. Zbl 1171.35041Bouchez, Vincent; Willem, Michel 3 2009 The limiting case for strongly indefinite functionals. Zbl 0817.58006Fournier, G.; Timoumi, M.; Willem, M. 3 1993 A convexity inequality. Zbl 1037.26019Roselli, Paolo; Willem, Michel 3 2002 Density, spectral theory and homoclinics for singular Sturm-Liouville systems. Zbl 0816.34016De Coster, C.; Willem, M. 3 1994 Multiple periodic solutions of infinite-dimensional pendulum-like equations. Zbl 1457.34066Fonda, Alessandro; Mawhin, Jean; Willem, Michel 2 2020 On the generalized Morse lemma. Zbl 0605.58016Mawhin, J.; Willem, M. 2 1985 Periodic solutions of the boundary value problem for the nonlinear heat equation. Zbl 0555.35062Nkashama, M. N.; Willem, M. 2 1984 On some nonlinear equations with critical exponents. Zbl 1166.35021Brezis, Haïm; Willem, Michel 2 2008 Aspects of Morse theory. Zbl 0723.58010Willem, Michel 2 1987 A relative isoperimetric inequality. Zbl 1254.26032Brock, Friedemann; Willem, Michel 2 2012 Range of nonlinear perturbations of linear operators with an infinite dimensional kernel. Zbl 0446.47059Mawhin, J.; Willem, M. 2 1980 Jean Mawhin’s contributions to critical point theory. Zbl 1295.35007Willem, Michel 2 2013 Linear elliptic systems involving finite Radon measures. Zbl 1161.35374Rădulescu, Vicenţiu; Willem, Michel 2 2003 Periodic solutions of some nonlinear second order differential equations in Hilbert spaces. Zbl 0599.34049Mawhin, Jean; Willem, Michel 1 1981 Periodic solutions of convex Hamiltonian systems. Zbl 0626.35013Willem, Michel 1 1984 Nonlinear elliptic partial differential equations. Workshop in celebration of Jean-Pierre Gossez’s 65th birthday, Bruxelles, Belgium, September 2–4, 2009. Zbl 1214.35002 1 2011 Simple variational methods for unbounded potentials. Zbl 0704.58012Fournier, G.; Willem, M. 1 1989 Periodic solutions of nonlinear differential equations in Hilbert spaces. Zbl 0419.34060Mawhin, Jean; Willem, Michel 1 1978 Semilinear elliptic equations in \(\mathbb{R} ^ N\) with almost periodic or unbounded forcing term. Zbl 0861.34023Fournier, Gilles; Szulkin, Andrzej; Willem, Michel 1 1996 Periodic solutions of symmetric wave equations. Zbl 0860.35007Ding, Y.; Li, S.; Willem, M. 1 1996 Multiple periodic solutions of infinite-dimensional pendulum-like equations. Zbl 1457.34066Fonda, Alessandro; Mawhin, Jean; Willem, Michel 2 2020 A Liouville theorem for the \(p\)-Laplacian and related questions. Zbl 1421.35170Farina, Alberto; Mercuri, Carlo; Willem, Michel 4 2019 Partial symmetry of vector solutions for elliptic systems. Zbl 1298.35206Wang, Zhi-Qiang; Willem, Michel 24 2014 Functional analysis. Fundamentals and applications. Zbl 1284.46001Willem, Michel 43 2013 Jean Mawhin’s contributions to critical point theory. Zbl 1295.35007Willem, Michel 2 2013 A relative isoperimetric inequality. Zbl 1254.26032Brock, Friedemann; Willem, Michel 2 2012 Nonlinear elliptic partial differential equations. Workshop in celebration of Jean-Pierre Gossez’s 65th birthday, Bruxelles, Belgium, September 2–4, 2009. Zbl 1214.35002 1 2011 Existence of nodal solutions for some nonlinear elliptic problems. Zbl 1233.35081de Valeriola, Sébastien; Willem, Michel 1 2011 A global compactness result for the \(p\)-Laplacian involving critical nonlinearities. Zbl 1193.35051Mercuri, Carlo; Willem, Michel 37 2010 Origin and evolution of the Palais-Smale condition in critical point theory. Zbl 1205.58009Mawhin, Jean; Willem, Michel 12 2010 Some critical minimization problems for functions of bounded variations. Zbl 1201.49006Bartsch, Thomas; Willem, Michel 4 2010 Ground state solutions for a semilinear problem with critical exponent. Zbl 1240.35205Szulkin, Andrzej; Weth, Tobias; Willem, Michel 12 2009 On some quasilinear critical problems. Zbl 1182.35090De Valeriola, Sébastien; Willem, Michel 9 2009 Least energy nodal solutions of the Brezis-Nirenberg problem in dimension \(N=5\). Zbl 1178.35175Roselli, Paolo; Willem, Michel 6 2009 Schrödinger equation with multiparticle potential and critical nonlinearity. Zbl 1195.35145Chabrowski, Jan; Szulkin, Andrzej; Willem, Michel 4 2009 Extremal functions for the Caffarelli-Kohn-Nirenberg inequalities: A simple proof of the symmetry. Zbl 1171.35041Bouchez, Vincent; Willem, Michel 3 2009 Symmetry of solutions of semilinear elliptic problems. Zbl 1148.35025Van Schaftingen, Jean; Willem, Michel 23 2008 Morse theory and nonlinear differential equations. Zbl 1236.58023Bartsch, Thomas; Szulkin, Andrzej; Willem, Michel 7 2008 On some nonlinear equations with critical exponents. Zbl 1166.35021Brezis, Haïm; Willem, Michel 2 2008 Weighted Sobolev embedding with unbounded and decaying radial potentials. Zbl 1220.35026Su, Jiabao; Wang, Zhi-Qiang; Willem, Michel 92 2007 Nonlinear Schrödinger equations with unbounded and decaying radial potentials. Zbl 1141.35056Su, Jiabao; Wang, Zhi-Qiang; Willem, Michel 74 2007 Solutions of a system of diffusion equations. Zbl 1134.35094Ding, Yanheng; Luan, Shixia; Willem, Michel 15 2007 Principles of functional analysis. (Principes d’analyse fonctionnelle.) Zbl 1205.46001Willem, Michel 8 2007 Hardy’s inequality on exterior domains. Zbl 1089.26012Chabrowski, J.; Willem, M. 1 2006 Partial symmetry of least energy nodal solutions to some variational problems. Zbl 1206.35086Bartsch, Thomas; Weth, Tobias; Willem, Michel 125 2005 The Dirichlet problem for superlinear elliptic equations. Zbl 1207.35001Bartsch, Thomas; Wang, Zhi-Qiang; Willem, Michael 37 2005 On multiple solutions of the exterior Neumann problem involving critical Sobolev exponent. Zbl 1256.35015Chabrowski, Jan; Willem, Michel 1 2005 Set transformations, symmetrizations and isoperimetric inequalities. Zbl 1453.26034Van Schaftingen, J.; Willem, M. 18 2004 Partial symmetry and asymptotic behavior for some elliptic variational problems. Zbl 1274.35026Smets, Didier; Willem, Michel 86 2003 On a Schrödinger equation with periodic potential and spectrum point zero. Zbl 1030.35068Willem, Michel; Zou, Wenming 73 2003 Elliptic problems with critical exponents and Hardy potentials. Zbl 1163.35383Ruiz, D.; Willem, M. 60 2003 Caffarelli–Kohn–Nirenberg inequalities with remainder terms. Zbl 1037.26014Wang, Zhi-Qiang; Willem, Michel 42 2003 A Sobolev inequality with remainder term and critical equations on domains with topology for the polyharmonic operator. Zbl 1059.31006Bartsch, Thomas; Weth, Tobias; Willem, Michel 42 2003 Remarks on a Hardy-Sobolev inequality. Zbl 1035.35020Secchi, Simone; Smets, Didier; Willem, Michel 32 2003 Elementary functional analysis. (Analyse fonctionnelle élémentaire.) Zbl 1089.46001Willem, Michel 9 2003 A decomposition lemma and critical minimization problems. Zbl 1194.35122Willem, Michel 5 2003 Linear elliptic systems involving finite Radon measures. Zbl 1161.35374Rădulescu, Vicenţiu; Willem, Michel 2 2003 Non-radial ground states for the Hénon equation. Zbl 1160.35415Smets, Didier; Willem, Michel; Su, Jiabao 121 2002 Least energy solutions of a critical Neumann problem with a weight. Zbl 1221.35116Chabrowski, J.; Willem, M. 18 2002 A semilinear elliptic equation on \(\mathbb R^N\) with unbounded coefficients. Zbl 1094.35054Sintzoff, P.; Willem, M. 8 2002 Hardy-Sobolev inequalities with remainder terms. Zbl 1033.35044Rădulescu, Vicenţiu; Smets, Didier; Willem, Michel 8 2002 A convexity inequality. Zbl 1037.26019Roselli, Paolo; Willem, Michel 3 2002 Singular minimization problems. Zbl 0954.35074Wang, Z.-Q.; Willem, M. 47 2000 Positive solutions for elliptic equations with critical growth in unbounded domains. Zbl 0968.35050Ramos, M.; Wang, Z.-Q.; Willem, M. 19 2000 Eigenvalue problems with indefinite weight. Zbl 0931.35121Szulkin, Andrzej; Willem, Michel 42 1999 Homoclinic orbits of a Hamiltonian system. Zbl 0997.37041Ding, Yanheng; Willem, Michel 41 1999 Existence of many positive solutions of semilinear elliptic equations on an annulus. Zbl 0911.35051Wang, Zhi-Qiang; Willem, Michel 10 1999 Multiple solutions for asymptotically linear boundary value problems in which the nonlinearity crosses at least one eigenvalue. Zbl 0933.35066Li, Shujie; Willem, Michel 22 1998 Periodic solutions of symmetric wave equations. Zbl 0909.35092Ding, Yanheng; Li, Shujie; Willem, Michel 12 1998 Solitary waves with prescribed speed on infinite lattices. Zbl 0889.34059Smets, D.; Willem, M. 79 1997 Minimax theorems. Zbl 0856.49001Willem, Michel 1,401 1996 Nontrivial solution of a semilinear Schrödinger equation. Zbl 0864.35036Troestler, C.; Willem, M. 67 1996 Extrema problems with critical Sobolev exponents on unbounded domains. Zbl 0851.49004Ben-Naoum, A. K.; Troestler, C.; Willem, M. 64 1996 A multiplicity result for the generalized Kadomtsev-Petviashvili equation. Zbl 0902.35100Wang, Z.-Q.; Willem, M. 7 1996 Semilinear elliptic equations in \(\mathbb{R} ^ N\) with almost periodic or unbounded forcing term. Zbl 0861.34023Fournier, Gilles; Szulkin, Andrzej; Willem, Michel 1 1996 Periodic solutions of symmetric wave equations. Zbl 0860.35007Ding, Y.; Li, S.; Willem, M. 1 1996 On an elliptic equation with concave and convex nonlinearities. Zbl 0848.35039Bartsch, Thomas; Willem, Michel 127 1995 Applications of local linking to critical point theory. Zbl 0820.58012Li, Shujie; Willem, Michel 125 1995 Real harmonic analysis. (Analyse harmonique réelle.) Zbl 0839.43001Willem, Michel 16 1995 Limit relative category and critical point theory. Zbl 0794.58007Fournier, G.; Lupo, D.; Ramos, M.; Willem, M. 25 1994 Existence and multiplicity results for homogeneous second order differential equations. Zbl 0808.58013Ben Naoum, A. K.; Troestler, C.; Willem, M. 20 1994 Periodic solutions of non-autonomous Hamiltonian systems with symmetries. Zbl 0794.58037Bartsch, Th.; Willem, M. 17 1994 Existence and multiplicity results for semicoercive unilateral problems. Zbl 0808.58015Goeleven, D.; Nguyen, V. H.; Willem, M. 4 1994 Density, spectral theory and homoclinics for singular Sturm-Liouville systems. Zbl 0816.34016De Coster, C.; Willem, M. 3 1994 Multiple solutions of semi-linear elliptic equations on \(\mathbb{R}^ N\). Zbl 0812.35007Munyamarere, François; Willem, Michel 1 1994 Infinitely many radial solutions of a semilinear elliptic problem on \(\mathbb{R}^ N\). Zbl 0790.35020Bartsch, Thomas; Willem, Michel 108 1993 Infinitely many nonradial solutions of a Euclidean scalar field equation. Zbl 0790.35021Bartsch, Thomas; Willem, Michel 90 1993 Subharmonic solutions for second order differential equations. Zbl 0803.34029Fonda, A.; Ramos, M.; Willem, M. 14 1993 The limiting case for strongly indefinite functionals. Zbl 0817.58006Fournier, G.; Timoumi, M.; Willem, M. 3 1993 Extrema problems with critical Sobolev exponents on unbounded domains. Zbl 0844.58077Ben-Naoum, A. K.; Troestler, C.; Willem, M. 1 1993 On an elliptic equation with concave and convex nonlinearities. Zbl 0837.35049Bartsch, Thomas; Willem, Michel 1 1993 Homoclinic orbits for a class of Hamiltonian systems. Zbl 0759.58018Omana, W.; Willem, M. 156 1992 Existence and multiplicity results for homogeneous second order differential equations. Zbl 0837.34029Ben-Naoum, A. K.; Troestler, C.; Willem, M. 1 1992 A lemma of quantitative deformation in the variational calculus. (Abstract). (Un lemme de déformation quantitatif en calcul des variation. (Resumée).) Zbl 0850.58009Willem, M. 1 1992 Generic results for the existence of nondegenerate periodic solutions of some differential systems with periodic nonlinearities. Zbl 0742.34043Martinez-Amores, P.; Mawhin, J.; Ortega, R.; Willem, M. 9 1991 Relative category and the calculus of variations. Zbl 0719.58010Fournier, G.; Willem, M. 17 1990 A note on Palais-Smale condition and coercivity. Zbl 0782.58019Caklovic, L.; Li, Shujie; Willem, M. 16 1990 Critical point theory and Hamiltonian systems. Zbl 0676.58017Mawhin, Jean; Willem, Michel 1,085 1989 Multiple solutions of the forced double pendulum equation. Zbl 0683.70022Fournier, G.; Willem, M. 24 1989 Subharmonic oscillations of forced pendulum-type equations. Zbl 0708.34028Fonda, A.; Willem, M. 18 1989 Bifurcation, symmetry and Morse theory. Zbl 0676.58020Willem, Michel 6 1989 Simple variational methods for unbounded potentials. Zbl 0704.58012Fournier, G.; Willem, M. 1 1989 Lusternik-Schnirelman theory and asymptotically linear Hamiltonian systems. Zbl 0622.34044Costa, D.; Willem, M. 3 1987 Time-periodic solutions of boundary value problems for nonlinear heat, telegraph and beam equations. Zbl 0622.35004Nkashama, M. N.; Willem, M. 3 1987 Aspects of Morse theory. Zbl 0723.58010Willem, Michel 2 1987 Critical points of convex perturbations of some indefinite quadratic forms and semilinear boundary value problems at resonance. Zbl 0678.35091Mawhin, J.; Willem, M. 49 1986 Variational methods and semilinear elliptic equations. Zbl 0656.35044Mawhin, J.; Ward, J. R. jun.; Willem, M. 45 1986 Multiple critical points of invariant functionals and applications. Zbl 0628.35037Costa, D. G.; Willem, M. 8 1986 Necessary and sufficient conditions for the solvability of a nonlinear two-point boundary value problem. Zbl 0559.34014Mawhin, J.; Ward, J. R.; Willem, M. 21 1985 Subharmonic oscillations of convex Hamiltonian systems. Zbl 0579.34030Willem, M. 19 1985 Subharmonic oscillations of a semilinear wave equation. Zbl 0588.35054Willem, Michel 8 1985 On the generalized Morse lemma. Zbl 0605.58016Mawhin, J.; Willem, M. 2 1985 Multiple solutions of the periodic boundary value problem for some forced pendulum-type equations. Zbl 0557.34036Mawhin, J.; Willem, M. 73 1984 Periodic oscillations of odd second order Hamiltonian systems. Zbl 0582.58014Willem, Michel 11 1984 Points critiques multiples de fonctionnelles invariantes. (Multiple critical points of invariant functionals). Zbl 0581.58010Costa, David; Willem, Michel 4 1984 Variational methods and boundary value problems for vector second order differential equations and applications to the pendulum equation. Zbl 0563.34048Mawhin, J.; Willem, M. 3 1984 Periodic solutions of the boundary value problem for the nonlinear heat equation. Zbl 0555.35062Nkashama, M. N.; Willem, M. 2 1984 Periodic solutions of convex Hamiltonian systems. Zbl 0626.35013Willem, Michel 1 1984 Lectures on critical point theory. (Given at the University of Brasilia in January and February 1983). Zbl 0541.58016Willem, Michel 5 1983 Remarks on the dual least action principle. Zbl 0528.58006Willem, M. 5 1982 ...and 13 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 2,451 Authors 152 Tang, Xianhua 74 Alves, Claudianor Oliveira 56 Zou, Wenming 55 Miyagaki, Olimpio Hiroshi 54 Chen, Haibo 48 Ding, Yanheng 48 Wang, Zhi-Qiang 47 Tang, Chun-Lei 46 Papageorgiou, Nikolaos S. 44 Su, Jiabao 39 Shi, Haiping 39 Yang, Minbo 34 Figueiredo, Giovany Malcher 34 Rădulescu, Vicenţiu D. 32 Chen, Sitong 32 Willem, Michel 31 Ma, Shiwang 31 Schechter, Martin 31 Wu, Tsungfang 31 Wu, Xian 31 Zhao, Fukun 30 Zhang, Fubao 29 Van Schaftingen, Jean 28 Chen, Guanwei 27 Li, Shujie 27 Liu, Xia 27 Wang, Jun 27 Zhang, Zhitao 26 Mawhin, Jean L. 25 Zhang, Jihui 25 Zhang, Wen 24 Bartsch, Thomas J. 24 Chen, Peng 24 Do Ó, João M. Bezerra 24 Wu, Xingping 24 Yu, Jian-She 24 Zhang, Ziheng 23 Huang, Yisheng 23 Sun, Juntao 23 Weth, Tobias 23 Zhang, Yuanbiao 22 Chen, Jianqing 22 He, Xiaoming 22 Xu, Junxiang 22 Zanolin, Fabio 22 Zhang, Jian 21 Ambrosio, Vincenzo 21 Chen, Shaowei 21 Peng, Shuangjie 21 Szulkin, Andrzej 20 Clapp, Mónica 20 Ge, Weigao 19 Liang, Sihua 19 Lin, Xiaoyan 19 Tang, Chunlei 19 Tian, Yu 18 Cheng, Bitao 18 Furtado, Marcelo Fernandes 18 Kajikiya, Ryuji 18 Li, Yongkun 18 Mao, Anmin 18 O’Regan, Donal 18 Zhang, Xingyong 17 Deng, Yinbin 17 Kristály, Alexandru 17 Liu, Shibo 17 Teng, Kaimin 17 Terracini, Susanna 17 Yuan, Rong 17 Zhao, Leiga 16 Guo, Yuxia 16 Guo, Zhiming 16 Han, Zhiqing 16 Li, Fuyi 16 Molica Bisci, Giovanni 16 Motreanu, Dumitru 16 Nieto Roig, Juan Jose 16 Qin, Dongdong 16 Wei, Juncheng 16 Zhang, Binlin 15 Liu, Zhaoli 15 Repovš, Dušan D. 15 Squassina, Marco 15 Zhou, Jianwen 14 Badiale, Marino 14 Bonheure, Denis 14 Carrião, Paulo Cesar 14 Chabrowski, Jan H. 14 Costa, David Goldstein 14 Liang, Zhanping 14 Medeiros, Everaldo S. 14 Ou, Zengqi 14 Rolando, Sergio 14 Tersian, Stepan Agop 14 Torres Ledesma, César Enrique 14 Zhang, Jianjun 13 Agarwal, Ravi P. 13 Albuquerque, Francisco S. B. Albuquerque 13 Cingolani, Silvia 13 Deng, Xiaoqing ...and 2,351 more Authors all top 5 Cited in 287 Serials 439 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 419 Journal of Mathematical Analysis and Applications 276 Journal of Differential Equations 135 Boundary Value Problems 128 Calculus of Variations and Partial Differential Equations 93 Applied Mathematics Letters 76 Journal of Mathematical Physics 72 Nonlinear Analysis. Theory, Methods & Applications 68 Communications on Pure and Applied Analysis 67 Applied Mathematics and Computation 67 Abstract and Applied Analysis 67 Nonlinear Analysis. Real World Applications 65 Computers & Mathematics with Applications 64 Communications in Contemporary Mathematics 64 Advances in Difference Equations 57 Journal of Functional Analysis 55 ZAMP. Zeitschrift für angewandte Mathematik und Physik 54 Discrete and Continuous Dynamical Systems 52 NoDEA. 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English Series 18 Acta Applicandae Mathematicae 18 Journal de Mathématiques Pures et Appliquées. Neuvième Série 18 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 18 Journal of Function Spaces 17 Mathematische Nachrichten 17 The Journal of Geometric Analysis 17 Journal of Nonlinear Science and Applications 16 Journal of Difference Equations and Applications 16 Journal of Applied Analysis and Computation 15 Acta Mathematicae Applicatae Sinica. English Series 15 Communications in Partial Differential Equations 15 Electronic Journal of Differential Equations (EJDE) 14 Journal d’Analyse Mathématique 14 Nonlinearity 14 Advances in Mathematics 14 Journal of Inequalities and Applications 14 Discrete and Continuous Dynamical Systems. Series S 13 Monatshefte für Mathematik 12 Manuscripta Mathematica 12 Results in Mathematics 12 Discrete Dynamics in Nature and Society 12 Comptes Rendus. Mathématique. Académie des Sciences, Paris 12 Milan Journal of Mathematics 11 Archiv der Mathematik 11 Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Serie IX. Rendiconti Lincei. Matematica e Applicazioni 10 Mathematical and Computer Modelling 10 European Series in Applied and Industrial Mathematics (ESAIM): Control, Optimization and Calculus of Variations 10 Taiwanese Journal of Mathematics 10 Journal of the European Mathematical Society (JEMS) 10 Journal of Applied Mathematics 10 AIMS Mathematics 9 Mathematische Annalen 9 Proceedings of the Edinburgh Mathematical Society. Series II 9 Applications of Mathematics 9 Journal of Elliptic and Parabolic Equations 8 Chaos, Solitons and Fractals 8 Journal of Computational and Applied Mathematics 8 Science in China. 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Armenian Academy of Sciences 6 Potential Analysis 6 Bulletin des Sciences Mathématiques 6 Mathematical Problems in Engineering 6 Journal of Dynamical and Control Systems 6 International Journal of Nonlinear Sciences and Numerical Simulation 6 Discrete and Continuous Dynamical Systems. Series B ...and 187 more Serials all top 5 Cited in 53 Fields 2,710 Partial differential equations (35-XX) 815 Ordinary differential equations (34-XX) 780 Global analysis, analysis on manifolds (58-XX) 470 Dynamical systems and ergodic theory (37-XX) 422 Operator theory (47-XX) 241 Calculus of variations and optimal control; optimization (49-XX) 172 Difference and functional equations (39-XX) 157 Functional analysis (46-XX) 125 Mechanics of particles and systems (70-XX) 91 Real functions (26-XX) 71 Quantum theory (81-XX) 52 Differential geometry (53-XX) 41 Integral equations (45-XX) 35 Optics, electromagnetic theory (78-XX) 34 Numerical analysis (65-XX) 25 Mechanics of deformable solids (74-XX) 24 Fluid mechanics (76-XX) 21 Statistical mechanics, structure of matter (82-XX) 16 Potential theory (31-XX) 15 Algebraic topology (55-XX) 13 Biology and other natural sciences (92-XX) 12 Operations research, mathematical programming (90-XX) 12 Systems theory; control (93-XX) 10 Probability theory and stochastic processes (60-XX) 9 Topological groups, Lie groups (22-XX) 8 Relativity and gravitational theory (83-XX) 7 Measure and integration (28-XX) 7 Abstract harmonic analysis (43-XX) 7 Convex and discrete geometry (52-XX) 6 Harmonic analysis on Euclidean spaces (42-XX) 5 Manifolds and cell complexes (57-XX) 4 History and biography (01-XX) 4 Special functions (33-XX) 4 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 3 Algebraic geometry (14-XX) 3 General topology (54-XX) 2 Linear and multilinear algebra; matrix theory (15-XX) 2 Several complex variables and analytic spaces (32-XX) 2 Approximations and expansions (41-XX) 2 Statistics (62-XX) 2 Computer science (68-XX) 2 Classical thermodynamics, heat transfer (80-XX) 1 General and overarching topics; collections (00-XX) 1 Combinatorics (05-XX) 1 Number theory (11-XX) 1 Field theory and polynomials (12-XX) 1 Category theory; homological algebra (18-XX) 1 Group theory and generalizations (20-XX) 1 Functions of a complex variable (30-XX) 1 Integral transforms, operational calculus (44-XX) 1 Astronomy and astrophysics (85-XX) 1 Geophysics (86-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year Wikidata Timeline The data are displayed as stored in Wikidata under a Creative Commons CC0 License. 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