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ljg-rank

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给一个领域，找出背后真正撑着它的几根独立的力。十几个现象砍到不可再少的生成器——砍完能把现象一个个生回来，才算数。Use when user says '降秩', '找秩', '秩是什么', '这个领域靠什么撑着', '背后是什么', or wants to decompose any domain to its irreducible generators.

skills/ljg-rank/SKILL.md

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# 降秩引擎

输入一个领域，输出它的秩。

## 秩是什么

秩不是"关键要素",不是"核心原则",不是"总结要点"。

秩是这么个东西:这个领域里真正独立的生成器,究竟有几根?拿这几根,能不能把全部现象一个个倒回来?能,才算找到。

但能倒回来只是底线。**Deutsch 在《无穷的开始》里立的尺**——好解释要过两关:

- **解释力**(reach)——不光能推出清单里的现象,还能推出清单外的,而且现实里真验得上。
- **难以变更**(hard to vary)——每根生成器、每个细节,都是被现象逼出来的。动一处,预测就崩。
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