FA-15185 / Numerics / Member archive
Combinadic unrank: strict preceding element ceiling · case 05
The exact combinadic unrank result violates the stated contract at strict preceding element ceiling.
Case contract
Input [k,r], k>=1 and r>=0; unique increasing combination of k nonnegative integers with colex rank r. Bounds: 1<=k<=5 and 0<=r<=49.
Why this case matters
Exact discrete arithmetic with observable algorithmic state; no floating point approximation is used.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| explicit oracle 0 | [3, 5] | [4, 5] | Failed |
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