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let the category setup handle the ideals #38821

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@fchapoton fchapoton commented Oct 17, 2024

This is removing the ideal methods in the old Ring and Field classes, moving them to the category setup.

Also removing one custom ideal method in multiple polynomial rings.

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note : the removal of "ideal" in multi-polynomial requires a careful check, as it may have hidden side-effects

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At first sight, it seems to be ok thanks to the _ideal_class_ method in src/sage/rings/polynomial/multi_polynomial_ring_base.pyx

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