Euler characteristic of a topological space X

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Euler characteristic of a topological space X [′ȯi·lər ‚kar·ik·tə′ris·tik əv ə ‚täp·ə¦läj·i·kəl ¦spās ′eks]

(mathematics)

The number χ(X) = Σ(-1)^qβ_q, where β_qis theqth Betti number ofX.

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