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Answers for “为什么环面的第一贝蒂数是 2?”

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Betti numbers are a sequence of topological invariants that indicate how many holes of each dimension an object has. For example, the first Betti number counts one-dimensional circular holes, and the second counts two-dimensional holes.

Conditions: Applies to topological spaces, especially simplicial complexes.; Each entry in the sequence corresponds to a different hole dimension.