Danes, Josef A covering theorem for mappings between metric spaces. (English) Zbl 0519.54035 General topology and its relations to modern analysis and algebra V, Proc. 5th Prague Topol. Symp. 1981, Sigma Ser. Pure Math. 3, 122-126 (1983). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 54H25 Fixed-point and coincidence theorems (topological aspects) 47J05 Equations involving nonlinear operators (general) 49K27 Optimality conditions for problems in abstract spaces Keywords:Ptak’s induction theorem; covering principle for mappings between metric spaces; classical Lyusternik theorem concerning relative extrema Citations:Zbl 0484.00009; Zbl 0464.49017 PDFBibTeX XML