FA-39877 / Heap invariants / Member archive

Fibonacci child ownership is checked against the grandparent · case 02

The bounded fibonacci rings certificate reports an incorrect backlinks.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

A finite Fibonacci-ring certificate stores nodes [key,parent,left,right,degree,mark,children]. All references are in range or parent=-1. Report broken circular-link reciprocity, parent-child backlinks, degree mismatch, marked roots, roots, and designated minimum validity.

Why this case matters

This isolates an internal heap representation or priority-structure invariant using deterministic finite records.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression certificate 3	`{"backlinks": [[0, 1], [0, 2]], "degrees": [], "minimum_valid": true, "reciprocity": [], "root_ids": [0], "root_marks": []}`	`{"backlinks": [], "degrees": [], "minimum_valid": true, "reciprocity": [], "root_ids": [0], "root_marks": []}`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.