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---
title: "自映射 (Self-Map)"
type: concept
tags: [math, recursion, formalization, fixed-point]
---
## Definition
自映射是集合到自身的映射。在递归自优化生成系统中,自映射 $\Phi: \mathcal{G} \to \mathcal{G}$ 定义为:
$$\Phi(G) = M\big(G,\; O(G(I),\; \Omega)\big)$$
即:给定当前生成器 $G$,执行一次"生成→优化→更新"循环后得到新生成器 $\Phi(G)$。
## Core Insight
自映射是递归自优化系统的核心数学结构。迭代应用 $\Phi$ 产生生成器序列 $\{G_n\}$
$$G_{n+1} = \Phi(G_n)$$
系统的收敛目标不是某个具体输出,而是在生成器空间中找到一个不动点。
## Properties
- 迭代性:对 $G_0$ 反复应用 $\Phi$ 得到序列 $\{G_n\}$
- 收敛性:当 $\Phi$ 满足连续性或收缩性条件时,序列收敛到 $G^*$
- 自引用:$G_n$ 既是被更新的对象,又是更新的执行者
## Relationship to Fixed Point
- 自映射 $\Phi$ 的不动点 $G^*$ 满足 $\Phi(G^*) = G^*$
- 不动点代表"生成能力已达到稳定状态,无需进一步更新"
## Source
- [[A Formalization of Recursive Self-Optimizing Generative Systems]]