Theorem: conjugate_mul (LeanCourse/Lectures/Lecture9Before.lean)

State before:
G : Type u_1
H✝ : Type u_2
K : Type u_3
inst✝² : Group G
inst✝¹ : Group H✝
inst✝ : Group K
x y : G
H : Subgroup G
⊢ conjugate (x * y) H = conjugate x (conjugate y H)
Tactic:
sorry
State after:
no goals