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-rw-r--r--theories/Reals/Rderiv.v4
1 files changed, 2 insertions, 2 deletions
diff --git a/theories/Reals/Rderiv.v b/theories/Reals/Rderiv.v
index effbc3a404..69a41db4db 100644
--- a/theories/Reals/Rderiv.v
+++ b/theories/Reals/Rderiv.v
@@ -17,7 +17,7 @@ Require Import Rbase.
Require Import Rfunctions.
Require Import Rlimit.
Require Import Lra.
-Require Import Omega.
+Require Import Lia.
Local Open Scope R_scope.
(*********)
@@ -341,7 +341,7 @@ Proof.
rewrite cond in H2; rewrite cond; simpl in H2; simpl;
cut (1 + x0 * 1 * 0 = 1 * 1);
[ intro A; rewrite A in H2; assumption | ring ].
- cut (n0 <> 0%nat -> S (n0 - 1) = n0); [ intro | omega ];
+ cut (n0 <> 0%nat -> S (n0 - 1) = n0); [ intro | lia ];
rewrite (H3 cond) in H2; rewrite (Rmult_comm (x0 ^ n0) (INR n0)) in H2;
rewrite (tech_pow_Rplus x0 n0 n0) in H2; assumption.
Qed.