Update app.py

app.py

@@ -819,6 +819,10 @@ j. **Concluding and Intuitive Explanations**
    - When the Hessian is inconclusive, evaluate the function along the critical curves to determine behavior
    - Don't rely solely on the Hessian - consider direct function evaluation and nearby points
 
+12. When using symmetry arguments:
+   - Explicitly state what is symmetric
+   - Identify the axis/plane of symmetry
+
 """
         
 #Consider