From 34d9cb1793772a0555d3446b7fdd36438a06edb6 Mon Sep 17 00:00:00 2001
From: Lafrite <lafrite@poneyworld.net>
Date: Mon, 6 Apr 2015 17:57:57 +0200
Subject: [PATCH] some bugs have been solve new have been discover!

---
 bugs | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/bugs b/bugs
index 553d1d1..f302e91 100644
--- a/bugs
+++ b/bugs
@@ -1,7 +1,5 @@
 * Soustraction de Polynômes!!!!
 
-
-
 * Expression importe mal 4x^2
     In [9]: e = Expression("3x + 4x^2 - 1")
 
@@ -69,11 +67,27 @@
 
     TypeError: unsupported operand type(s) for +: 'type' and 'str'
 
-* Parenthèses abhérentes
+* (solved) Parenthèses abhérentes
 
     In [7]: P = Polynom([-6, 12, -20])
 
     In [8]: print(P)
     ( - 20 x^{  2 } + 12 x ) - 6
     
+
+* Chainer des opérations et sauvegarde des étapes
+
+    In [12]: R = P-Q - P
+
+    In [13]: R
+    Out[13]: < Polynom [-4, -5, 0]>
+
+    In [14]: for i in R.explain():
+        print(i)
+    ....:     
+    3 x^{  2 } - 3 x - 3 - ( 3 x^{  2 } + 2 x + 1 )
+    3 x^{  2 } - 3 x - 3 -  3 x^{  2 } - 2 x - 1
+    ( 3 - 3 ) x^{  2 } + ( -3 - 2 ) x - 3 - 1
+    - 5 x - 4
+