χ = V − E + F
χ = b 0 − b 1 + b 2 − b 3 + ...
χ = k 0 − k 1 + k 2 − ... ,
Euler characteristic
Euler-Charakteristik
topological invariant in mathematics
topologische Invariante in der Mathematik
Euler-Poincaré characteristic
Euler-Poincaré-Charakteristik
Euler-Poincare-Charakteristik
Eulercharakteristik