Isaacs's 'few days' near-miss claim against Pontryagin is single-witness self-testimony, with no independent corroboration located

rufus-isaacslev-pontryaginpriority-disputesingle-witnessdocumentary-source-criticismarchival-research

claim-isaacs-1965-preface-recounts-missing-pontryagin-priority-by-days rests entirely on Rufus Isaacs's own 1965 preface. A search this session for a second telling of the Pontryagin encounter — the MacTutor biography page and the INFORMS "Isaacs, Rufus" biographical profile, both archived directly this session with TLS verified — found that neither mentions Pontryagin, the maximum principle, or the 1963 near-miss at all; the MacTutor biography instead quotes Isaacs's own RAND-reception account from a different piece ("Through the Rand seminars, my colleagues were privy to my progress... it dwindled"), while the INFORMS profile summarizes his RAND years in its own words without quoting him — neither touches the Pontryagin episode. His 1969 JOTA paper and his 1974/75 "The past and some bits of the future" (Warwick NATO ASI proceedings, Reidel 1975) — the two most likely places for a second, differently-timed telling, the direct analog of Werbos's 1988-vs-1993 divergence — were not located in freely readable form this session.

This is the same evidentiary structure moc-testimony-is-not-a-record names for Werbos's lost documents: testimony about a margin, not an independently timestamped record of one. [unverified-mechanism — whether a corroborating record of the 1963 encounter exists in Isaacs's RAND/IDA/Center-for-Naval-Analyses papers, held at Johns Hopkins, is not established by this search], routed to question-verify-isaacs-pontryagin-1963-near-miss-corroboration. This is a search result, not a proof of non-existence — a stronger claim than the evidence supports would say more than the search found.