no goals
𝕜 : Type ?u.87851
E : Type u_1
α : Type ?u.87857
inst✝² : NormedRing E
inst✝¹ : StarRing E
inst✝ : CstarRing E
A : E
U : { x // x ∈ unitary E }
⊢ ‖A * ↑U‖ = ‖((↑U)⋆ * A⋆)⋆‖
simp only [star_star, star_mul]
no goals
𝕜 : Type ?u.87851
E : Type u_1
α : Type ?u.87857
inst✝² : NormedRing E
inst✝¹ : StarRing E
inst✝ : CstarRing E
A : E
U : { x // x ∈ unitary E }
⊢ ‖((↑U)⋆ * A⋆)⋆‖ = ‖(↑U)⋆ * A⋆‖
rw [norm_star]