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(* Test apply in *)
Goal (forall x y, x = S y -> y=y) -> 2 = 4 -> 3=3.
intros H H0.
apply H in H0.
assumption.
Qed.
Require Import ZArith.
Open Scope Z_scope.
Goal forall x y z, ~ z <= 0 -> x * z < y * z -> x <= y.
intros; apply Znot_le_gt, Zgt_lt in H.
apply Zmult_lt_reg_r, Zlt_le_weak in H0; auto.
Qed.
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