Star Chromatic Number Calculator

no 2-color P₄

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About Star Chromatic Number Calculator

A star chromatic number calculator computing χ_s(G): proper coloring where every 2-colored subgraph is a star forest (no P₄ in two colors). χ_s ≥ a(G) ≥ χ(G). For planar: χ_s ≤ 20 (Albertson et al). NP-hard. Client-side.

Star Chromatic Number Calculator Features

  • χ_s value
  • vs a(G)
  • No 2-color P₄
  • Star forest
  • Common graphs

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