diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index a9ff3c1..a044004 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -1,5 +1,5 @@
 def identity_conjunctive(variable, zero):
-    if variable == 1 and zero == 0:
+    if zero == 0:
         return variable
     else:
         return None
diff --git a/src/test/py/test_logical_operations.py b/src/test/py/test_logical_operations.py
index 83cbace..0eda349 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -9,12 +9,15 @@ class calculationsWithRoots(unittest.TestCase):
     def tearDown(self):
         pass
 
-    def test_conjunctive_identity_1_and_0_equals_x(self):
+    def test_disconjunctive_identity_1_and_0_equals_x(self):
         self.assertEqual(identity_conjunctive(1, 0), 1)
 
-    def test_conjunctive_identity_1_and_1_equals_NULL(self):
+    def test_disconjunctive_identity_1_and_1_equals_NULL(self):
         self.assertEqual(identity_conjunctive(1, 1), None)
 
+    def test_disconjunctive_identity_1_and_1_equals_NULL(self):
+        self.assertEqual(identity_conjunctive(0, 1), None)
+
 
 if __name__ == "__main__":
     unittest.main()