Theorem: LO.Modal.Standard.Formula.Kripke.Satisfies.dia_def (Logic/Modal/Standard/Kripke/Semantics.lean)

State before:
α : Type u_1
M : Model α
w : M.World
p q : Formula α
⊢ Satisfies M w (◇p) ↔ ∃ w', w ≺ w' ∧ Satisfies M w' p
Tactic:
simp [Satisfies]
State after:
no goals