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Create the page "For a retraction the induced homomorphism on the fundamental group is surjective" on this wiki! See also the page found with your search.

  • Topological retraction
    {{Refactor notice|grade=A*|msg=Messy as ... - it's just awful}} * So {{M|r_*\circ(i_A)_*}} must be a [[bijection]]
    2 KB (384 words) - 10:49, 14 December 2016
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