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+Require Rfunctions.
+Require Fourier.
+
+Lemma l1:
+ (x, y, z : R)
+ ``(Rabsolu x-z) <= (Rabsolu x-y)+(Rabsolu y-z)``.
+Intros; SplitAbsolu; Fourier.
+Qed.
+
+Lemma l2:
+ (x, y : R)
+ ``x < (Rabsolu y)`` ->
+ ``y < 1`` -> ``x >= 0`` -> ``-y <= 1`` -> ``(Rabsolu x) <= 1``.
+Intros.
+SplitAbsolu; Fourier.
+Qed.