FA-15157 / Numerics / Member archive
Colex combination rank: combinatorial place accumulation · case 02
The exact colex combination rank result violates the stated contract at combinatorial place accumulation.
Case contract
Input strictly increasing selected nonnegative integers; zero-based colex rank=sum choose(a_i,i+1).
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 | 0 | 1 | Failed |
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