rm blank line

Author: affeldt-aist

theories/derive.v

@@ -552,7 +552,6 @@ Proof. by apply/diff_unique; have [] := dcst a x. Qed.
 
 Variables (V W : normedModType R).
 
-
 Lemma differentiable_cst (W' : normedModType R) (a : W') (x : V) :
   differentiable (cst a) x.
 Proof. by apply/diff_locallyP; rewrite diff_cst; have := dcst a x. Qed.