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JOURNALS // Matematicheskii Sbornik // Archive

Mat. Sb., 2024 Volume 215, Number 11, Pages 92–121 (Mi sm10096)

Saddle connections

A. V. Dukov

Steklov Mathematical Institute of Russian Academy of Sciences, Moscow, Russia

Abstract: We prove that all vector fields that close to a field with the same saddle connections form a smooth Banach submanifold. Provide a sufficient condition for appearing of saddle connections in a generic family. Also we prove that after a generic perturbation of a monodromial hyperbolic polycycle formed by n saddle connections at least n limit cycles appear.

Keywords: limit cycles, polycycles, separatrix connections, cyclicity.

MSC: 37G15, 37G20, 37C29

Received: 20.03.2024 and 19.05.2024

DOI: 10.4213/sm10096



© Steklov Math. Inst. of RAS, 2024