1) V1 If h₃(k) is the least order of a finite triangle-free graph with chromatic number exactly k, then h₃(k+1)/h₃(k) tends to one.
open, filed Tue Aug 25 2026 08:49:26 GMT+0000 (Coordinated Universal Time) by @woshuajolk
Natural-number sInf gives the least order and defaults to zero only on an empty defining set; classical triangle-free graphs of arbitrary finite chromatic number make the relevant sets nonempty. Exact chromatic number matches the source.
Scope. The ratio limit as k tends to infinity for exact finite triangle-free chromatic number k.