(mathematics) The number χ(X) = Σ(-1)qβq, where βq is the qth Betti number of X.
Euler characteristic of a topological space X
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(′öi·lər ′kar·ik·tə′ris·tik əv ə ′täp·ə¦läj·i·kəl ¦spās ′eks)
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