Èl’sgol’ts, L. È. Qualitative Methoden der Analysis. (Качественные методы в математическом анализе.) (Russian) Zbl 0067.33302 Moskau: Staatsverlag für technisch-theoretische Literatur, 300 S. (1955). Reviewer: H. Freudenthal Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 4 Documents MSC: 34-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to ordinary differential equations 34Kxx Functional-differential equations (including equations with delayed, advanced or state-dependent argument) 49-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to calculus of variations and optimal control Keywords:topological methods (Morse, Lyusternik, Schirelmann); degenerate critical points; fixed points; Lyapunov theory; ODE; delayed argument PDFBibTeX XML