Theorem: Finset.mul_mulStab_mul_mul_mul_mulStab_mul (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
⊢ s * (s * t).mulStab * (t * (s * t).mulStab) = s * t
Tactic:
rw [mul_mul_mul_comm, mulStab_mul_mulStab, mul_mulStab]
State after:
no goals