Theorem SimpleGraph.isAcyclic_iff_forall_not_isCycle

Modification history

2026-10-17 16:48
Mathlib/Combinatorics/SimpleGraph/Acyclic.lean
feat(Combinatorics/SimpleGraph/Acyclic): a graph is a tree iff it's acyclic and has exactly `n - 1` edges (#34910)
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