diff --git a/02-intro_rna/01-perceptron.py b/02-intro_rna/01-perceptron.py
index e056ba0..782ec43 100644
--- a/02-intro_rna/01-perceptron.py
+++ b/02-intro_rna/01-perceptron.py
@@ -122,9 +122,6 @@ def tanh(_x):
 def derivation(f, _x, eps=0.000001):
     return (f(_x + eps) - f(_x))/eps
 
-def derivation(f, _x, eps=0.000001):
-    return (f(_x + eps) - f(_x))/eps
-
 # Fonctions d'activation
 f_activ_ax = fig.add_subplot(2,4,2) 
 f_activ_ax.set_title("Fonctions d'activation")