Update app.py

app.py

@@ -24,15 +24,22 @@ def clean_latex(latex):
     latex = re.sub(r'\\([+\-=])', r'\1', latex)
 
     # 🔁 Replace common misrecognized symbols
+    # 🔁 Replace common misrecognized symbols (with and without backslash)
     replacements = {
-        r'\chi': 'x',
-        r'\xi': 'x',
-        r'\alpha': 'a',
-        r'\beta': 'b',
-        r'\gamma': 'y'
+        r'\\chi': 'x',  # With escape
+        r'chi': 'x',    # After \chi becomes plain
+        r'\\xi': 'x',
+        r'xi': 'x',
+        r'\\alpha': 'a',
+        r'alpha': 'a',
+        r'\\beta': 'b',
+        r'beta': 'b',
+        r'\\gamma': 'y',
+        r'gamma': 'y'
     }
     for wrong, correct in replacements.items():
-        latex = latex.replace(wrong, correct)
+        latex = re.sub(wrong, correct, latex)
+
 
     # Replace mathcal variables
     latex = re.sub(r'\\(cal|mathcal)\s*X', 'x', latex)