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Euler characteristic
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topological invariant in mathematics
~21 min read
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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
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homotopy
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CW complex
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polyhedron
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parity
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face
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planar graph
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connected space
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homology
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mathematics
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René Descartes
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Leonhard Euler
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International Standard Book Number
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natural number
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circle
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complex number
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topology
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rational number
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set
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sphere
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