THE LEVEL SET OF A SMOOTH MAPPING IN A NEIGHBORHOOD OF A SINGULAR POINT, AND ZEROS OF A QUADRATIC MAPPING

DOI10.1070/SM1992v073n02ABEH002555zbMath0772.46021OpenAlexW2012515705MaRDI QIDQ3135798

Evgeniy Avakov, Aram V. Arutyunov, Andrei A. Agrachev

Publication date: 9 September 1993

Published in: Mathematics of the USSR-Sbornik (Search for Journal in Brave)

Full work available at URL: https://eudml.org/doc/72285

zbMATH Keywords

critical pointorthogonal projectionsMorse lemma

Mathematics Subject Classification ID

Abstract critical point theory (Morse theory, Lyusternik-Shnirel'man theory, etc.) in infinite-dimensional spaces (58E05) Derivatives of functions in infinite-dimensional spaces (46G05)

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