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2012 2012 2012 2012	Henri Poincaré Centennial Issue Edited by Ferdinand Verhulst and Steven Wepster 147 Editorial Ferdinand Verhulst and Steven Wepster 154 Interview with Henri Poincaré: Mathematics is the art of giving the same name to different things Ferdinand Verhulst 159 Henri Poincaré and partial differential equations Jean Mawhin 170 Self-excited oscillations: from Poincaré to Andronov Jean-Marc Ginoux 178 Poincaré and the idea of a group Jeremy Gray 187 Asymptotic series of Poincaré and Stieltjes Hasse van Boven, Rob Wesselink, Steven Wepster 191 Poincaré and Brouwer on intuition and logic Dirk van Dalen 196 Poincaré and Analysis Situs, the beginning of algebraic topology Dirk Siersma 201 Perspectives on the legacy of Poincaré in the field of dynamical systems Henk Broer 209 The interaction of geometry and analysis in Henri Poincaré's conceptions Ferdinand Verhulst 217 Increasing insightful thinking in analytic geometry Mark Timmer and Nellie Verhoef 220 Book descriptions: New books about Henri Poincaré Jean-Marc Ginoux, Ferdinand Verhulst, Jeremy Gray 148 Servicepagina 149 Agenda 151 Nieuws 223 Problemen