diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index 179714b..3b519aa 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -6,7 +6,7 @@ def identity_disconjunctive(variable, operator, zero):
 
 
 def identity_conjunctive(variable, operator, zero):
-    if zero == 0 and operator == "+":
+    if zero == 1 and operator == ".":
         return variable
     else:
         return None
diff --git a/src/test/py/test_logical_operations.py b/src/test/py/test_logical_operations.py
index 364d887..b52791d 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -27,6 +27,9 @@ class calculationsWithRoots(unittest.TestCase):
     def test_conjunctive_identity_1_and_0_equals_None(self):
         self.assertEqual(identity_conjunctive(1, ".", 0), None)
 
+    def test_conjunctive_identity_1_and_0_equals_None(self):
+        self.assertEqual(identity_conjunctive(0, ".", 1), 0)
+
 
 if __name__ == "__main__":
     unittest.main()