On the Second Relative Homotopy Group of an Adjunction Space: An Exposition of a Theorem of J. H. C. Whitehead
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Publication:3862742
DOI10.1112/jlms/s2-22.1.146zbMath0427.55012OpenAlexW2085896032MaRDI QIDQ3862742
Publication date: 1980
Published in: Journal of the London Mathematical Society (Search for Journal in Brave)
Full work available at URL: https://doi.org/10.1112/jlms/s2-22.1.146
second homotopy group2-dimensional version of the Seifert-van Kampen theoremattaching 2-cellshomological characterisation of free crossed modules
Homotopy groups of special spaces (55Q52) Homotopy groups of wedges, joins, and simple spaces (55Q20)
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