diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index 297746f..179714b 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -3,3 +3,10 @@ def identity_disconjunctive(variable, operator, zero):
         return variable
     else:
         return None
+
+
+def identity_conjunctive(variable, operator, zero):
+    if zero == 0 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 051ad51..69a9886 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -21,6 +21,9 @@ class calculationsWithRoots(unittest.TestCase):
     def test_disconjunctive_identity_0_or_0_equals_0(self):
         self.assertEqual(identity_disconjunctive(0, "+", 0), 0)
 
+    def test_disconjunctive_identity_0_or_0_equals_01(self):
+        self.assertEqual(identity_conjunctive(0, ".", 0), None)
+
 
 if __name__ == "__main__":
     unittest.main()