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【求助】拓扑数学题求助
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有一套拓扑方面的数学题，请求虫友帮忙！急，重赏80金 1.Please prove that“f homotopic to g”is an equivalence relation for functions f,g : X → Y . 2.Please prove that“X is homotopic to Y ”is an equivalence relation for spaces X and Y . 3.A starlike space S ⊂ Rn is a subspace S of Rn that satisfies the followin gproperty: there exists a point s ∈ S sothat for every point x ∈ S,there is a straight line path from x to s.Please prove thate very starlike space S is contractible.（Rn中n为上标） |
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2楼2011-03-17 22:51:36