Еftekharinasab, KavehLastivka, Ivan2023-02-282023-02-282021Еftekharinasab K. A Lusternik-Schnirelmann Type Theorem for C1-Frechet Manifolds / K. Еftekharinasab, I. Lastivka // Journal of the Indian Mathematical Society, Vol. 88, No. 3 (2021). Р. 309 – 322.0019-58392455-6475https://er.nau.edu.ua/handle/NAU/58124The edition materials are posted in ScopusWe prove a Lusternik-Schnirelmann type theorem for a C1-function φ : M → R, where M is a connected in nite dimensional Frechet manifold of class C1. To this end, in this context we prove the so-called Deformation Lemma and by using it we derive the result generalizing the Minimax PrincipleenLusternik-Schnirelmann theoremdeformation LemmaFr echet Finsler manifoldsvariational problemsArticle10.18311/jims/2021/27836