Steen, Lynn Arthur; Seebach, J. Arthur jun. Counterexamples in topology. 2nd ed. (English) Zbl 0386.54001 New York - Heidelberg - Berlin: Springer-Verlag. XI, 244 p. (1978). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 4 ReviewsCited in 96 Documents MSC: 54-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to general topology 54G20 Counterexamples in general topology PDF BibTeX XML OpenURL Online Encyclopedia of Integer Sequences: Triangle T(n,m) read by rows: 3^n if m is odd, 0 if m is even.