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Fitch's paradox of knowability

modal logic paradox where the following propositions are contradictory: (A) knowledge implies truth, (B) knowing a conjunction implies knowing each conjunct, (C) all truths are knowable, (D) some truths are not known
Thing paradox Q5455413
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Fitch's paradox of knowability

Summary

Fitch's paradox of knowability is a paradox[1]. It draws 68 Wikipedia views per month (paradox category, ranking #66 of 104).[2]

Key Facts

  • Fitch's paradox of knowability's instance of is recorded as paradox[3].
  • Fitch's paradox of knowability's Freebase ID is recorded as /m/04bl_c[4].
  • Fitch's paradox of knowability's Stanford Encyclopedia of Philosophy ID is recorded as fitch-paradox[5].
  • Fitch's paradox of knowability's Microsoft Academic ID is recorded as 2776385180[6].

Why It Matters

Fitch's paradox of knowability draws 68 Wikipedia views per month (paradox category, ranking #66 of 104).[2]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . Stanford Encyclopedia of Philosophy. Retrieved . plato.stanford.edu. Provenance: wikidata.org.
  4. [6] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). Fitch's paradox of knowability. Retrieved May 3, 2026, from https://4ort.xyz/entity/fitch-s-paradox-of-knowability
MLA “Fitch's paradox of knowability.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/fitch-s-paradox-of-knowability.
BibTeX @misc{4ortxyz_fitch-s-paradox-of-knowability_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{Fitch's paradox of knowability}}, year = {2026}, url = {https://4ort.xyz/entity/fitch-s-paradox-of-knowability}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): Fitch's paradox of knowability — https://4ort.xyz/entity/fitch-s-paradox-of-knowability (retrieved 2026-05-03)

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