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Large Language ModelsAI Safety & AlignmentLessWrong AIPublished: Sep 1, 2026, 01:00 JST1 min read

Belief-desire view: derived from control theory

Belief-desire view: derived from control theory

Key takeaway

  • A new post argues beliefs and desires come from optimal control and reinforcement learning.

  • It suggests they are properties of optimal policies.

  • This challenges the folk psychology view of agents.

3 Key Points

  1. What happened

    A post argues that the belief-desire view of agents can be derived from classic theorems in optimal control and reinforcement learning.

  2. Why it matters

    This suggests beliefs and desires are properties of optimal policies, not just folk psychology assumptions.

  3. What to watch

    Whether this derivation changes how agents are modeled in AI and related fields.

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Context & Analysis

The post's argument reinterprets a foundational concept in psychology and economics—that agents act on beliefs and desires—through the lens of optimal control and reinforcement learning. By deriving this view from classic theorems, it positions beliefs and desires not as assumptions from folk psychology but as emergent properties of optimal policies. This could have implications for how AI systems are designed and understood, though the body does not detail specific applications. The introduction also emphasizes the importance of the agent-environment boundary and the dual role of reasons, but the post does not yet provide the full derivation or its consequences.

FAQ

What is the main argument of the post?
It argues the belief-desire view of agents can be derived from classic theorems in optimal control and reinforcement learning, suggesting these are properties of optimal policies.
How does the post define an agent?
An agent is a well-differentiated system that acts based on beliefs and desires, where beliefs are about the current state of affairs and desires are motivations for achieving goals.

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