Fix logic error when computing rank deficient weak Popov forms with some options #41280
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…bination of options include_zero_vectors=False and ordered=True
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vincentmacri
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Dec 10, 2025
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Looks good! Thank you for the quick fix!
My only requested change is a small formatting fix, you can set this to positive review after making the change.
Co-authored-by: Vincent Macri <[email protected]>
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Fixes #41278
This concerns univariate polynomial matrices and the main interface for weak Popov forms (
weak_popov_form) which mostly handles options (the main computation is deferred to_weak_popov_formwhich is unchanged by this PR).In the rank deficient case, with some specific options (
include_zero_vectors=Falseandordered=True), the code contained some misplaced logic concerning zero rows that happened too late in the computations, leading to wrong results (see #41278).This PR fixes this issue, adds a test for it, and also makes some minor enhancements in code style.
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