fact: Definition rel_prod_fmap {X1 X2 Y1 Y2} (f1:RelCat⦅X1;Y1⦆) (f2:RelCat⦅X2;Y2⦆) : RelCat⦅rel_prod X1 X2; rel_prod Y1 Y2⦆.
imports: Coq(ssreflect ssrfun ssrbool) Coq(Relation_Definitions Morphisms) Mon(SPropBase) Relational(Category RelativeMonads EnrichedSetting)