proposition: Lemma t2pos: 0 <= t2.
proof: Proof. Proof with auto with typeclass_instances. apply FLX_pos_is_pos. apply Rplus_le_le_0_compat. apply Rle_trans with (1:=cPos); apply Rle_trans with (1:=cLeb); exact bLea. apply FLX_pos_is_pos. apply Rle_0_minus. exact cLeb. Qed.
imports: Coq(ZArith Reals Psatz) Flocq(Core Relative Sterbenz Operations) Interval(Tactic)