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Fix Hessian of x^y for y ∈ (1, 2) - #3102

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odow merged 1 commit into
jump-dev:masterfrom
timholy:teh/fix-pow-integer
Oct 13, 2026
Merged

odow merged 1 commit into
jump-dev:masterfrom
timholy:teh/fix-pow-integer

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@timholy

@timholy timholy commented Oct 13, 2026

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Fixes #3101

Assisted-by: Claude Opus 5.5 noreply@anthropic.com

Fixes jump-dev#3101

Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
@odow
odow merged commit 9470528 into jump-dev:master Oct 13, 2026
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@odow

odow commented Oct 13, 2026

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Thanks Tim!

@mlubin, this might be a new record for the longest time a bug was undiscovered. Stretches back to ReverseDiffSparse.jl in February 2016: https://github.com/mlubin/ReverseDiffSparse.jl/pull/25/changes#diff-ecde0fe39f8fc92e0d7136b4756061e4c30c29b64b9fc1cffc3e7642a4555c8dR260-R262

@timholy
timholy deleted the teh/fix-pow-integer branch October 13, 2026 23:45
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Hessian for x^y fails for y that happen to be integers

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