最終更新日：2024/07/30

(topology, of a topological space) The sum of even-dimensional Betti numbers minus the sum of odd-dimensional ones.

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Euler characteristic

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Euler characteristic

noun

(topology, of a topological space) The sum of even-dimensional Betti numbers minus the sum of odd-dimensional ones.

The Euler characteristic of a torus is 0.

意味（1）

(topology, of a topological space) The sum of even-dimensional Betti numbers minus the sum of odd-dimensional ones.