exact Equivalent.obj?_none_iff set_equiv |>.mp ho
case h.none
α : Type
inst✝¹ : Accessible α
rtr : α
inst✝ : Finite α
cpt : Component.Valued
vs : ID ⇀ Value
i : Component.idType (Component.val cpt)
ho : rtr[Component.val cpt][i] = none
⊢ set rtr cpt vs[Component.val cpt][i] = none
no goals