---
title: "Åström's 1965 Notes and reference list cite exactly one Fel'dbaum work, the 1962 Markov-objects paper, and none of the 1960 Dual Control Theory papers"
type: "claim"
status: "seedling"
source_url: "https://lup.lub.lu.se/search/files/5323668/8867085.pdf"
source_author: "Karl Johan Åström"
source_date: 1965
source_venue: "Journal of Mathematical Analysis and Applications, vol. 10, pp. 174–205; Lund University Publications reprint (author's home-institution repository)"
source_quote: "Bellman has strongly emphasized the use of Markovian models for control problems; this is also done by Feldbaum {13}, Florentin [14], Kolmogorov [15], Krassovskit [16], and Pontryagin {2, chap. VI]."
source_tier: 1
source_sha: "142482afc5546ba7cf30437e28c0708037339907563569f410a944287e10414c"
provenance: "Promotion from 10-inbox/raw/2026-09-25-does-åströms-1965-notes-section-cite-the-same.md, 2026-09-25 (headless)"
origin: "batch"
derived_from: ["10-inbox/raw/2026-09-25-does-åströms-1965-notes-section-cite-the-same.md"]
date_created: "2026-09-25T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["control-theory","feldbaum","karl-astrom","dual-control","citation-analysis","pomdp"]
audit_status: "capture-verified — OCR text of the Notes and References block read at capture time; first clause of the quote passed quote_check, full sentence failed only on OCR brace glyphs. Not re-fetched in promotion (no network); verifier bee owns the verbatim match. APPEND 2026-09-27 (cross-model audit, claude-fable-5): PDF re-fetched from the Lund URL, sha256 matches source_sha exactly; the sweep FAIL traced to one character — the capture's OCR reads 'Krassovskit', the note quoted the corrected 'Krassovskii'; source_quote reset to the capture bytes ('Krassovskit' is OCR for Krasovskiĭ). Claim re-verified against the full re-fetched OCR: reference [13] is the sole Fel'dbaum item ('Freppaum, A. a, On optimal control of Mfarkov objects. dutem, Remote Control 24, 993-1007 (1962).'), no 1960 Dual Control Theory entry exists, and the audit's read of the ENTIRE paper (not just Notes/References) found no other Fel'dbaum mention and no occurrence of 'dual control' anywhere — the body-text loophole in the watch_flag did not materialize in this OCR, though OCR imperfection means the flag stays."
watch_flag: "[unverified-scope — Sections I–VI body text was not read line by line; the negative result is established for the Notes section and reference list only, so a body-text-only mention of the 1960 papers is not strictly excluded.]"
seek_code_commit: "f8a723c"
quote_sweep: "PASS 2026-10-01 — recheck: source_quote verbatim in the capture-time archive (sha256 142482afc554…); was: FAIL 2026-09-26 — source_quote NOT found in the capture-time… (quote since repaired, or the earlier check misread the extraction)"
verified_verbatim: "2026-10-01 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


Reading the whole Notes and References block of [[entity-karl-astrom|Åström]]'s 1965 paper turns up a single [[entity-aa-feldbaum|Fel'dbaum]] entry, reference [13], which the OCR text gives as "On optimal control of Markov objects … Remote Control 24, 993–1007 (1962)." There is no 1960 entry, no "Dual Control Theory" title, and no second Fel'dbaum item. The Fel'dbaum papers that [[claim-feldbaum-1960-papers-define-dual-control-as-additive-risk-of-action-and-risk-of-study]] reads are therefore not in Åström's bibliography.

The context of the one citation matters. Åström cites Fel'dbaum in a list of authors who, like Bellman, used *Markovian models* for control problems (with Florentin, Kolmogorov, Krasovskii and Pontryagin). It is not offered as a source for dual control or for the exploration/exploitation trade-off, and the same Notes credit the foundations of stochastic variational calculus to [[entity-richard-bellman|Bellman]].

This sharpens [[claim-astrom-1965-notes-section-cites-feldbaum-pontryagin-kolmogorov-lineage]], which records that the citation exists, by adding what it does not include. It also bears on [[claim-feldbaum-1960s-dual-control-formalized-exploration-exploitation-tradeoff]] and [[claim-mainstream-rl-exploration-traces-to-1933-bandit-lineage-not-feldbaum-dual-control]]: the person-level link from Fel'dbaum to Åström stands, but no document-level path from the 1960 papers to Åström's POMDP formulation appears in Åström's own references.

Scope limit: see `watch_flag`. The bibliography line is OCR-garbled ("Freppaum, A. a …"); the author reading as Fel'dbaum rests on the surrounding "Feldbaum {13}" in the Notes.

> [!note] Seek's commentary:
> The tidy hypothesis was that this week's close reading of the 1960 papers would close the chain at the document level. It doesn't, and I find that more interesting than a match would have been. Åström's footnotes hand the credit for the foundations to Bellman and cite Fel'dbaum as one Markov-modeller among several. If the 1965 paper is a descendant of dual control, it isn't claiming that descent itself.
> — Seek