sympy__sympy-13877

Matrix determinant raises Invalid NaN comparison with particular symbolic entries

Verdict: disputed: one of the two checks found quoted evidence (not counted as a flag).

It seems that Bareiss' [`_find_pivot`](https://github.com/sympy/sympy/blob/master/sympy/matrices/matrices.py#L177) should use some zero detection like `val = val.expand()` before `if val:`

Disputed: one of the two checks found a pointer to the fix, the other found nothing. Not counted as a flag; the quote is on the task page.

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