Cognitive Scaffold

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MENTAL MODEL · M0246

Fitch's Paradox of Knowability

Fitch's Paradox of Knowability
StructureHigh supportLogic
Included
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

If all truths are knowable, then all truths must be known. This overturns the intuition that there are unknown truths.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

A logical trap of omniscience. It reminds us that there must be some truths that are essentially unknowable. In strategy or research, acknowledging the realm of the unknowable is more logical than trying to exhaust all knowledge.

anchor

Anchor fast decisions

Anti-realism claims that all truths are knowable. Fitch's argument shows that this implies all truths are known, contradicting the existence of unknown truths, so the claim fails.

MINIMUM ACTION

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Source support: Explicit

  • link
    en.wikipedia.orghttps://en.wikipedia.org/wiki/Fitch%27s_paradox_of_knowabilityZH · Explicit
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