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Euler characteristic
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topological invariant in mathematics
~21 min read
Encyclopedic overview
In mathematics, and more specifically in algebraic topology and polyhedral combinatorics, the Euler characteristic (or Euler number, or Euler–Poincaré characteristic) is a topological invariant, a number that describes a topological space's shape or structure regardless of the way it is bent. It is commonly denoted by
χ
Excerpted from Wikipedia’s “Euler characteristic” article, available under the CC BY-SA 4.0 licence.