fact: Definition prl_map2_property S S' u g:= function_prop g (projective_limit S) (projective_limit S') /\ forall i, inc i (psI S) -> (Vg u i) \co (prl_can_fun S i) = (prl_can_fun S') i \co g.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat)