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wiki/concepts/固定点.md
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title: "固定点"
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type: concept
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tags: [math, theory, recursion]
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---
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## Definition
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固定点(Fixed Point)是数学中满足 f(x*) = x* 的点 x*,在自递归优化系统中对应系统达到稳态的生成能力。
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## In Self-Optimizing Generative Systems
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- 自映射 Φ: G → G 的不动点 G* 满足 Φ(G*) = G*
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- G* 是自洽的:其输出已编码自身改进所需的标准
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- 收敛性条件:Φ 满足连续性或收缩性时,可通过迭代获得 G*
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## Relationship to Y Combinator
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Y Combinator 是不动点组合子:Y f = f (Y f)
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在自递归系统中:G* = Y STEP,其中 STEP ≡ λG. M(G, O(G(I), Ω))
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## Connections
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- [[自递归优化生成系统]] ← 应用场景
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- [[Y Combinator]] ← 形式化工具
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