Doyle, P. H. Two criteria thrusting simply connectedness on manifolds. (English) Zbl 0269.57002 Colloq. Math. 31, 207-210 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page MSC: 57N15 Topology of the Euclidean \(n\)-space, \(n\)-manifolds (\(4 \leq n \leq \infty\)) (MSC2010) 54C15 Retraction PDFBibTeX XMLCite \textit{P. H. Doyle}, Colloq. Math. 31, 207--210 (1974; Zbl 0269.57002) Full Text: DOI