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sympy__sympy-12419

Based on the issue discussion and the hints provided, I can generate the fix. The problem is clearly identified in the GitHub issue discussion:

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  1. Install the skill (command above).
  2. In Claude Code, describe what you need - the skill turns on by itself when the context fits.
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Install (Claude Code)

mkdir -p .claude/skills/sympy-sympy-12419 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-12419.md -o .claude/skills/sympy-sympy-12419/SKILL.md

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Content

Based on the issue discussion and the hints provided, I can generate the fix. The problem is clearly identified in the GitHub issue discussion:

The `_entry` method of the `Identity` class in `sympy/matrices/expressions/matexpr.py` currently returns `S.One` when `i == j` and `S.Zero` otherwise. However, this comparison fails for symbolic indices because it incorrectly assumes that if `i` and `j` are different symbols, they represent different values.

The fix, as discussed in the issue, is to use `KroneckerDelta(i, j)` to properly handle the case where we don't know if `i == j` until actual va

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