diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index 3b519aa..42678a1 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -1,6 +1,8 @@
 def identity_disconjunctive(variable, operator, zero):
     if zero == 0 and operator == "+":
         return variable
+    elif variable == 0 and zero == 1:
+        return 1
     else:
         return None
 
diff --git a/src/test/py/test_logical_operations.py b/src/test/py/test_logical_operations.py
index 302c8e3..4099b13 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -16,7 +16,7 @@ class calculationsWithRoots(unittest.TestCase):
         self.assertEqual(identity_disconjunctive(1, "+", 1), None)
 
     def test_disconjunctive_identity_0_or_1_equals_None(self):
-        self.assertEqual(identity_disconjunctive(0, "+", 1), None)
+        self.assertEqual(identity_disconjunctive(0, "+", 1), 1)
 
     def test_disconjunctive_identity_0_or_0_equals_0(self):
         self.assertEqual(identity_disconjunctive(0, "+", 0), 0)
@@ -30,7 +30,7 @@ class calculationsWithRoots(unittest.TestCase):
     def test_conjunctive_identity_0_and_1_equals_0(self):
         self.assertEqual(identity_conjunctive(0, ".", 1), 0)
 
-    def test_conjunctive_identity_0_and_1_equals_01(self):
+    def test_conjunctive_identity_1_and_1_equals_1(self):
         self.assertEqual(identity_conjunctive(1, ".", 1), 1)