Mathematics – Group Theory
Scientific paper
2008-04-22
Advances in Math. 223 (2010), 2097-2113
Mathematics
Group Theory
16 pages
Scientific paper
We recall a group-theoretic description of the first non-vanishing homotopy
group of a certain (n+1)-ad of spaces and show how it yields several formulae
for homotopy and homology groups of specific spaces. In particular we obtain an
alternative proof of J. Wu's group-theoretic description of the homotopy groups
of a 2-sphere.
Ellis Graham
Mikhailov Roman
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