diff --git a/pymath/calculus/decorators.py b/pymath/calculus/decorators.py
index d533968..2773582 100644
--- a/pymath/calculus/decorators.py
+++ b/pymath/calculus/decorators.py
@@ -3,20 +3,6 @@
 
 from functools import wraps
 
-def is_same_step(new, old):
-    """Return whether the new step is the same than old step
-    """
-    try:
-        if new.replace(" ", "") == old.replace(" ", ""):
-            return True
-        else:
-            return False
-    except AttributeError:
-        if new == old:
-            return True
-        else:
-            return False
-
 def no_repetition(equals=lambda x,y: x == y):
     """ Remove yield values which has already been yield
 
diff --git a/pymath/calculus/explicable.py b/pymath/calculus/explicable.py
index 0a54f1c..9e46d74 100644
--- a/pymath/calculus/explicable.py
+++ b/pymath/calculus/explicable.py
@@ -5,7 +5,7 @@ from .renderable import Renderable
 from .step import Step
 from decimal import Decimal
 from .generic import transpose_fill
-from .decorators import is_same_step, no_repetition
+from .decorators import no_repetition
 
 
 class Explicable(Renderable):
@@ -57,7 +57,7 @@ class Explicable(Renderable):
         """ Generator which yield itself rendered """
         yield self.STR_RENDER(self.postfix_tokens)
 
-    @no_repetition(is_same_step)
+    @no_repetition()
     def history_generator(self):
         r""" Generator for rendered steps which leed to itself
 
diff --git a/pymath/calculus/step.py b/pymath/calculus/step.py
index da97089..bf6aa05 100644
--- a/pymath/calculus/step.py
+++ b/pymath/calculus/step.py
@@ -69,6 +69,14 @@ class Step(Renderable):
                         exp
                         ))
 
+    def __eq__(self, other):
+        try:
+            if self.postfix_tokens == other.postfix_tokens:
+                return True
+        except AttributeError:
+            return False
+
+        return False
 
 # -----------------------------
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