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sympy__sympy-22840

Based on the GitHub issue, I understand the problem with SymPy's cse() function. The issue is that when processing MatrixSymbol elements (like a[0, 0]), the cse() function incorrectly extracts the MatrixSymbol itself (like a) as a common…

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A skill that teaches Claude Code to do ai research tasks well. It is packaged knowledge the model uses whenever it is relevant.

  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-22840 && curl -fsSL https://doutorai.pt/data/lib/skills__sympy-sympy-22840.md -o .claude/skills/sympy-sympy-22840/SKILL.md

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Content

Based on the GitHub issue, I understand the problem with SymPy's `cse()` function. The issue is that when processing `MatrixSymbol` elements (like `a[0, 0]`), the `cse()` function incorrectly extracts the `MatrixSymbol` itself (like `a`) as a common subexpression, even though it shouldn't be.

Let me analyze this issue based on my knowledge of SymPy's codebase and create a patch:

The problem is in `sympy/simplify/cse_main.py`. When `cse()` walks the expression tree and finds `MatrixSymbol[i, j]` (which is a `MatrixElement`), it incorrectly identifies the `MatrixSymbol` as a valid subexpressio

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