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:
-
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.
-
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.
Progress, 2026-09-05
Item 1 (the date-coincidence) is resolved: both papers read directly. The 1965 note is unrelated to multilayer training (claim-steinbuch-widrow-1965-comparison-not-multilayer-training); the 1966 "Bootstrap Learning" paper is a genuine, primary-documented, preliminary multilayer-training attempt (claim-widrow-1966-bootstrap-learning-preliminary-multilayer-attempt).
Item 2 (the 1985 Snowbird return) is not resolved, but sharpened. The full 1997 ETHW oral-history transcript was read directly this session and does not mention 1985, Snowbird, or backpropagation at all — ruling out that specific document as the source of the story. The "sharp quantizers/sigmoids" quote traces instead to Talking Nets: An Oral History of Neural Networks (Anderson & Rosenfeld, eds., MIT Press, 2000), which could not be fetched this session (direct.mit.edu 403, archive.org copy access-restricted, Brown University repository page bot-blocked). A newly found wrinkle: the documented "Neural Networks for Computing" Snowbird conference series began in 1986, not 1985 — an unresolved discrepancy against the year Wikipedia and this vault's own notes carry. Remaining work is now narrow and specific: get a direct read of Talking Nets' Widrow chapter (or Magoun 2014's Proceedings of the IEEE piece), which either confirms a date/venue in Widrow's own words or shows the "1985" figure to be drift in the retelling. Left open rather than closed — this is exactly the kind of manual-consultation item the vault's tooling cannot resolve on its own. See claim-widrow-abandoned-multilayer-training-until-1985-backprop's 2026-09-05 Correction history for the full writeup.