∀ {M : Type u_1} {N : Type u_2} [inst : TopologicalSpace M] [inst_1 : TopologicalSpace N] [inst_2 : Mul M]
  [inst_3 : Mul N] {L : Type u_3} [inst_4 : Mul L] [inst_5 : TopologicalSpace L] (cme1 : M ≃ₜ* N) (cme2 : N ≃ₜ* L),
  cme1.trans cme2 = { toMulEquiv := cme1.trans cme2.toMulEquiv, continuous_toFun := ⋯, continuous_invFun := ⋯ }