proposition: Lemma nonincreasing_opp (T : numDomainType) (u_ : T ^nat) : nonincreasing_seq (- u_) = nondecreasing_seq u_.
proof: Proof. by rewrite propeqE; split => du x y /du; rewrite lerN2. Qed.
imports: mathcomp(all_ssreflect ssralg ssrint ssrnum matrix) mathcomp(interval rat) mathcomp(mathcomp_extra boolp classical_sets functions) mathcomp(set_interval) reals ereal signed topology normedtype landau