proposition: Lemma subdom_indomE p x : {subset dom x <= p} = {in dom x, p =1 predT}.
proof: Proof. by []. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path bigop) pcm(options prelude finmap seqperm pred seqext) pcm(pcm morphism)