Theorem: Finset.mul_subset_left (LeanCamCombi/Kneser/MulStab.lean)

State before:
ι : Type u_1
α : Type u_2
inst✝¹ : CommGroup α
inst✝ : DecidableEq α
s t : Finset α
a : α
⊢ t ⊆ s.mulStab → s * t ⊆ s
Tactic:
rw [mul_comm]
State after:
ι : Type u_1
α : Type u_2
inst✝¹ : CommGroup α
inst✝ : DecidableEq α
s t : Finset α
a : α
⊢ t ⊆ s.mulStab → t * s ⊆ s

State before:
ι : Type u_1
α : Type u_2
inst✝¹ : CommGroup α
inst✝ : DecidableEq α
s t : Finset α
a : α
⊢ t ⊆ s.mulStab → t * s ⊆ s
Tactic:
exact mul_subset_right
State after:
no goals