Update app.py

app.py

@@ -15,6 +15,17 @@ model = LatexOCR()
 
 # Clean LaTeX output
 def clean_latex(latex):
+    # Fix common OCR misreads like \chi → x
+    replacements = {
+        r'\chi': 'x',
+        r'\xi': 'x',
+        r'\alpha': 'a',
+        r'\beta': 'b',
+        r'\gamma': 'y'
+    }
+    for wrong, correct in replacements.items():
+        latex = latex.replace(wrong, correct)
+
     latex = re.sub(r'\\(cal|mathcal)\s*X', 'x', latex)
     latex = re.sub(r'\\(cal|mathcal)\s*Y', 'y', latex)
     latex = re.sub(r'\\(cal|mathcal)\s*Z', 'z', latex)
@@ -34,6 +45,7 @@ def clean_latex(latex):
         latex += '=0'
     return latex
 
+
 # Fallback to external LLM microservice
 def request_llm_fallback(bad_latex, llm_url):
     pre_cleaned = re.sub(