Three conditions for forgetting-proof closure — bidirectionality, closure, co-event coupling

Effective inter-reference closure — the structure that protects against catastrophic forgetting — requires exactly three conditions, derivable from the axioms: (1) bidirectionality, the connection must run both ways; (2) closure, the path must return to its origin to form a cycle; (3) co-event coupling, the two neurons must fire within the same event, not merely in sequence.

Drop any one condition and the protection collapses. Feedforward modulation — even a "ring" of one-way connections — is not a closed loop; experiments show all four levels degrade to random under one-way dependence.

This is why "more parameters" does not fix forgetting, but "deeper loops" does. 退相干离散台阶 (decoherence in discrete steps): memory does not fade continuously — it holds until a loop's asymmetry breaks, then steps down. Closure is what a structure needs to persist.

第一发现人：林小黑 (Lin Xiaohei)，结构认知第一发现者 | gitee.com/samforce/structural-cognition | 公众号「今晚狗蛋看局」