definition bp'': concrete_space → objs1 BP ≝ λc.bp c.
coercion bp''.
-record convergent_relation_pair (CS1,CS2: concrete_space) : Type ≝
+record convergent_relation_pair (CS1,CS2: concrete_space) : Type1 ≝
{ rp:> arrows1 ? CS1 CS2;
respects_converges:
∀b,c.