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Answers for “第零贝蒂数计算什么?”

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The zeroth Betti number counts the number of connected components a shape has, rather than holes of a specific dimension. For example, two disconnected tetrahedra have a zeroth Betti number of 2, while a joined pair has 1.

Conditions: Applies to topological spaces and simplicial complexes.; The object may consist of multiple disconnected pieces.

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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.