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excision theorem中文是什么意思

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  • 百科解釋
In algebraic topology, a branch of mathematics, the excision theorem is a useful theorem about relative homology?given topological spaces X and subspaces A and U such that U is also a subspace of A, the theorem says that under certain circumstances, we can cut out (excise) U from both spaces such that the relative homologies of the pairs (X,A) and (X U,A U) are isomorphic. This assists in computation of singular homology groups, as sometimes after excising an appropriately chosen subspace we obtain something easier to compute.
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