Lubański, M. An example of an absolute neighbourhood retract, which is the common boundary of three regions in the 3-dimensional Euclidean space. (English) Zbl 0051.40201 Fundam. Math. 40, 29-38 (1953). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document Keywords:topology × Cite Format Result Cite Review PDF Full Text: DOI EuDML