proposition: Corollary slice_uxou s i : s = &:s `]-oo, i] ++ &:s `]i, +oo[.
proof: Proof. by rewrite -(slice_split _ _ (i:=`]-oo, +oo[)) // slice_uu. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval order) pcm(options prelude ordtype seqext)