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Quasi Newton update admits nonpositive curvature · case 05

Quasi Newton update admits nonpositive curvature.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Return whether a finite Python integer/float vector pair may enter an undamped BFGS update under the strict curvature condition s dot y>0, evaluated exactly for the represented inputs; equal vector lengths are assumed.

Why this case matters

This deterministic solver-step model isolates an algorithmic invariant used by iterative optimization implementations.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
negative pair	`true`	`false`	Failed

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