# sympy__sympy-12419
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on the architect's analysis and the existing patches, I can see the issue. The simpler approach (second patch) just returns `KroneckerDelta(i, j)` directly, which will handle both symbolic and numeric cases correctly because `KroneckerDelta` itself evaluates to 1 or 0 for concrete equal/unequal indices.

However, the first approach is more explicit about handling concrete cases for efficiency. The architect's analysis suggests checking `Eq(i, j)` for literal True/False cases.

Let me generate the proper patch based on the architect's recommendation:

--- a/sympy/matrices/expressions/matexpr.py
+++ b/sympy/matrices/expressions/matexpr.py
@@ -1,6 +1,7 @@
 from __future__ import print_function, division
 
 from functools import wraps
+from sympy.functions.special.tensor_functions import KroneckerDelta
 
 from sympy.core import S, Symbol, Tuple, Integer, Basic, Expr
 from sympy.core.decorators import call_highest_priority
@@ -278,10 +279,11 @@ class Identity(MatrixExpr):
         return self.rows
 
     def _entry(self, i, j):
-        if i == j:
-            return S.One
-        else:
-            return S.Zero
+        eq = Eq(i, j)
+        if eq is S.true:
+            return S.One
+        elif eq is S.false:
+            return S.Zero
+        return KroneckerDelta(i, j)
 
     def _eval_transpose(self):
         return self