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23 lines
675 B
Markdown
23 lines
675 B
Markdown
---
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title: "Y Combinator"
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type: concept
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tags: [cs, lambda-calculus, recursion]
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---
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## Definition
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Y Combinator(不动点组合子)是 λ-calculus 中的标准递归机制:Y ≡ λf.(λx.f(x,x))(λx.f(x,x)),满足 Y f = f (Y f)。
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## In Self-Optimizing Systems
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在自递归优化生成系统中,稳定生成能力 G* 可表达为:
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G* = Y STEP
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其中 STEP ≡ λG. M(G, O(G(I), Ω))
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验证:STEP G* = M(G*, O(G*(I), Ω)) = G*(由固定点定义)
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## Core Insight
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Y Combinator 使无名字函数获得自参照能力,从而表达递归的生成器更新。
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## Connections
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- [[固定点]] ← 数学对应
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- [[自递归优化生成系统]] ← 应用场景
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