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fix .inverse_image() returning the zero element on the wrong curve #41529

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fix .inverse_image() returning the zero element on the wrong curve #41529

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@yyyyx4 yyyyx4 commented Jan 26, 2026 •
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Currently (Sage 10.8):

sage: E.<P, Q> = EllipticCurve(GF(5^2), [1, 2, 3, 3, 1])
sage: f = E.isogeny([P*3])
sage: f.inverse_image(0).curve() is f.domain()
False

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github-actions bot commented Jan 27, 2026 •
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Documentation preview for this PR (built with commit 2254e02; changes) is ready! 🎉
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@yyyyx4 yyyyx4 force-pushed the public/fix_inverse_image_result_on_wrong_curve branch from 3be6cc1 to 2254e02 Compare January 27, 2026 00:49
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