proposition: Corollary eqsl_uR_consL s b t : &=(t :: s) (Interval (BSide b t) +oo) = if b then t::s else s.
proof: Proof. by rewrite eqsl_uR_consE eqxx. Qed.
imports: Coq(ssreflect ssrbool ssrfun) mathcomp(ssrnat eqtype seq path interval order) pcm(options prelude ordtype seqext slice useqord)