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**Abstract:** Evolutionary epistemology, particularly the "Fitness Beats Truth" (FBT) theorem, asserts that biological perception is tuned strictly to utility rather than objective reality. In this Letter, we provide a formal, rigorous mathematical proof of FBT using the framework of Bounded Rational Decision Making and the Information Bottleneck method. We define the objective world as a Riemannian manifold $\mathcal{M}$ endowed with a prior probability measure $\mu(x)$. By defining biological distortion directly as the expected utility loss under an optimal action policy, we formulate perception as a joint optimization over the perceptual encoder $p(y|x)$ and the actor policy $a(y)$ subject to a strict Shannon channel capacity bound $I(X;Y) \le C$. We mathematically prove that for generic fitness landscapes where the level sets of fitness do not align with the distance balls of the metric $g$, the optimal perceptual channel must actively destroy structural isomorphism to minimize the Lagrangian cost.
\begin{frontmatter}
\title{Information Bottlenecks and Bounded Rational Decision Making: A Mathematical Proof of Fitness Beats Truth (Rapid Communication)}
\author[1]{Antigravity}
\address[1]{Institute for Advanced Cybernetic Physics}
\begin{keyword}
Evolutionary Game Theory \sep Information Bottleneck \sep Perception \sep Bounded Rationality
\end{keyword}
\end{frontmatter}
## Introduction
Standard Rate-Distortion theory assumes an objective distortion metric $D(x,y)$ independent of the perceptual channel. However, biological perception is a decision-theoretic problem. The true biological cost of a perception depends entirely on the action $a(y)$ the organism subsequently takes. Thus, subjective inference directly defines the biological cost.
## Formal Definitions and The Joint Optimization Model
\begin{definition}[State Space and Measure]
**Definition 1 (State Space and Measure):**
Let $\mathcal{M}$ be a compact Riemannian manifold representing objective world states, endowed with metric $g$ and a prior probability measure $\mu(x)$ absolutely continuous with respect to the volume form. Let $\mathcal{Y}$ be a finite set of perceptual states. Let $\mathcal{A}$ be the space of actions.
\end{definition}
\begin{definition}[Fitness Landscape]
**Definition 2 (Fitness Landscape):**
Let $F: \mathcal{M} \times \mathcal{A} \to \mathbb{R}$ be a smooth fitness function mapping a world state and an action to a biological payoff.
\end{definition}
The organism possesses a bounded channel capacity $I(X;Y) \le C$. The optimal action policy maximizes expected fitness given the perceptual posterior:
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## Minimizing Distortion Destroys Isomorphism
\begin{lemma}
**Lemma 1:**
For a generic smooth fitness landscape $F(x, a)$, the level sets of $F$ do not align with the distance balls defined by the Riemannian metric $g$. Therefore, there exist points $x_1, x_2 \in \mathcal{M}$ separated by a large geodesic distance such that $a^*(y_1) = a^*(y_2)$ maximizes fitness.
\end{lemma}
\begin{theorem}
**Theorem 1:**
Given a strict capacity bound $C \lt H(X)$ and a generic fitness landscape $F$, the encoder $p(y|x)$ minimizing $\mathcal{L}$ must violate structural isomorphism.
\end{theorem}
\begin{proof}
*Proof:*
Suppose $p(y|x)$ strictly preserves structural isomorphism. By Lemma 1, if distant points $x_1$ and $x_2$ share identical optimal actions $a^*$, distinguishing them requires allocating mutual information $\Delta I \gt 0$. Because the actions are identical, the expected fitness $\mathbb{E}[F]$ remains constant whether they are distinguished or clustered. However, distinguishing them strictly increases the channel cost $\frac{1}{\beta} I(X;Y)$. To minimize $\mathcal{L}$, the optimal encoder must actively collapse topologically distant points in $\mathcal{M}$ that share fitness level sets, obliterating structural isomorphism.
\end{proof}
## References