FA-16962 / Floating-point arithmetic / Member archive

Power increment moves the exponent inside log1p · case 02

Power increment moves the exponent inside log1p.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Evaluate (1+x)**y without first rounding a small increment into unity. Domain requires x>-1; y is finite, and fixtures have finite results. Finite results are rendered to eleven significant decimal digits; modeled domain violations and arithmetic errors are explicit strings.

Why this case matters

An offline floating representation model isolates a reproducible arithmetic fault.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
tiny amplified	`"3"`	`"7.3890560989"`	Failed

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