Commit 528bf9ce authored by Heiko Becker's avatar Heiko Becker
Browse files

Start using new lemma

parent a13cdb39
......@@ -185,7 +185,7 @@ Proof.
unfold substractInterval.
intros a b.
intros contained_1 contained_I2.
assert (a - b = a + (- b))%R as simpl_eq by (field_simplify; reflexivity).
rewrite Rsub_eq_Ropp_plus.
rewrite simpl_eq.
apply additionIsValid; auto.
apply negationIsValid; auto.
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