Charles Sanders Peirce

American philosopher, logician, and scientist (1839-1914) who named and theorized abduction — inference to the most plausible explanatory hypothesis given the evidence, distinct from deduction and induction. Matters to this vault as the namesake standing behind two independent claim clusters that have each invoked him without a page of his own: the three-way logical-inference typology that names him as abduction's originator, and the recurring question of whether intelligence-analysis's Analysis of Competing Hypotheses genuinely descends from his reasoning method. A 2026-09-19 bridge investigation adds a third thread: part of the philosophical literature classifies the historiographical argument from silence as a species of the modern "inference to the best explanation" gloss on his abduction — a connection to his work that is real and sourced, even where the vault's older ACH-abduction question remains unconfirmed.

References

• claim-inference-logical-types
• claim-no-primary-source-documents-ach-abduction-similarity
• claim-lipton-construes-argument-from-silence-as-inference-to-best-explanation
• observation-ach-abduction-lucky-widrow-notes-share-argument-from-silence-method-classified-as-abductive
• Captures: 2026-09-19-bipartite-two-things-this-vault-knows-in-different