![](https://www.eurekalert.org/socialshare/EurekAlert-bluebg_Twitter_1200x675.jpg)
Characteristics
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.