diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index 6b3b78a..9edc386 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -21,3 +21,10 @@ def identity(first_input, operator, second_input):
         return identity_disconjunctive(first_input, second_input)
     else:
         return identity_conjunctive(first_input, second_input)
+
+
+def one_zero(first_input, second_input):
+    if first_input == 0 and second_input == 0:
+        return None
+    else:
+        return 1
diff --git a/src/test/py/test_logical_operations.py b/src/test/py/test_logical_operations.py
index f994cc2..1667909 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -33,6 +33,9 @@ class calculationsWithRoots(unittest.TestCase):
     def test_identity_1_and_1_equals_1(self):
         self.assertEqual(identity(1, ".", 1), 1)
 
+    def test_one_zero_1_or_1_equals_1(self):
+        self.assertEqual(one_zero(1, 1), 1)
+
 
 if __name__ == "__main__":
     unittest.main()