ContextFreeGrammar.derives_iff_eq_or_head

∀ {T : Type u_1} {g : ContextFreeGrammar T} {u w : List (Symbol T g.NT)},
  g.Derives u w ↔ u = w ∨ ∃ v, g.Produces u v ∧ g.Derives v w

Defined in: Mathlib.Computability.ContextFreeGrammar
Cited by: 1 results in Mathlib
Foundations: Depth 56 from the axioms · uses propext, Classical.choice, Quot.sound

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