Theorem: Finset.mem_mulStab' (LeanCamCombi/Kneser/MulStab.lean)

State before:
ι : Type u_1
α : Type u_2
inst✝¹ : Group α
inst✝ : DecidableEq α
s t : Finset α
a : α
hs : s.Nonempty
⊢ a ∈ s.mulStab ↔ ∀ ⦃b : α⦄, b ∈ s → a • b ∈ s
Tactic:
rw [← mem_coe, coe_mulStab hs, SetLike.mem_coe, mem_stabilizer_finset']
State after:
no goals