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Line 3: is bijective for <math>q < m+n-2</math> and is surjective for <math>q = m+n-2</math>. A geometric proof is given in ~~abook~~a book by Tom Dieck.<ref>T. tom Dieck, ''Algebraic Topology'', EMS Textbooks in Mathematics, (2008).</ref> This result should also be seen as a consequence of the [[Blakers–Massey theorem]], the most general form of which, dealing with the non-simply-connected case.<ref>R. Brown and J.-L. Loday, ''Homotopical excision and Hurewicz theorems for ''n''-cubes of spaces'', Proc. London Math. Soc., (3) 54 (1987) 176-192.</ref>

Homotopy excision theorem: Difference between revisions