Do Steinbuch & Widrow 1965 and Widrow's 1966 'Bootstrap Learning' actually document the abandoned multilayer-training attempt — and what does Widrow's oral history say about the 1985 return?
Raised while promoting claim-widrow-abandoned-multilayer-training-until-1985-backprop
and claim-madaline-rule-i-first-layer-trainable-second-fixed. The mechanism
and the Madaline Rule I architecture are now Tier-1 confirmed from Widrow & Lehr
1990 (read directly once the poppler/pdfinfo dependency was repaired,
2026-07-09). Two verifications remain:
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The 1965–66 date-coincidence. Two real Widrow papers fall in the window named by the original research question but their link to "the" abandoned attempt is unverified (the capture flagged this as a date-coincidence trap):
- Steinbuch & Widrow, "A Critical Comparison of Two Kinds of Adaptive Classification Networks," IEEE Trans. Electronic Computers EC-14(5):737–740, 1965 — https://isl.stanford.edu/~widrow/papers/j1965acritical.pdf
- Widrow, "Bootstrap Learning in Threshold Logic Systems," 3rd IFAC Congress, London, 1966 — https://isl.stanford.edu/~widrow/papers/c1966bootstraplearning.pdf Read each directly (the extract path now works — Widrow's other scanned PDFs extracted cleanly via pdftotext) and determine whether either paper is about a multilayer-training attempt or an adjacent topic.
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The 1985 Snowbird return. The specific "1985 Snowbird, Utah" reconnection to backpropagation currently rests on Yuxi Liu (T2) and Wikipedia (T4). The primary is Widrow's oral history (https://ethw.org/Oral-History:Bernard_Widrow, 403-blocked at capture time) or his 2023 "Ancient History" chapter. Confirm the date/venue and the "sharp quantizers / sigmoids / no one knew anything about it" quote against a directly-read primary.
Low-to-medium priority — the load-bearing claims are already primary-verified; this tightens the biographical precision and closes a flagged date-coincidence.