Werbos's 1988 reference list contains no Isaacs, Bellman, Pontryagin, Kelley, or Bryson; his documented control-theory lines run through Athans & Kalb (1966) and Oak Ridge adjoint sensitivity work
The reference list of Werbos (1988), read in full, includes Almeida 1987; Alsmiller et al. 1981 ("Adjoint sensitivity analysis and its application to LEAP Model 22c," ORNL/TM-7789); Athans & Kalb 1966 (Optimal control theory); Barto, Sutton & Anderson 1983; Dennis & Schnabel 1983; Forsythe & Moler 1967; Parker 1985; Pineda 1987; RHW 1986; and Werbos's own works. It lists no work by Isaacs, Bellman, Pontryagin, Kelley, or Bryson.
The control-theory lines Werbos does document are: backward information flows in system identification (his 1974 work), the Athans & Kalb book (named by a reviewer; see claim-werbos-1988-equates-dynamic-feedback-with-control-theorys-time-dependent-multipliers), the Oak Ridge adjoint method, and dynamic programming for the J function. Nothing in the reference list carries a path from Isaacs's 1951 RAND paper (claim-isaacs-p257-derives-optimal-paths-as-characteristics-of-value-pde-with-differentiated-half) to Werbos's formulation.
Scope of the negative. This is a claim about the bibliography. The body text was read only through roughly lines 1-743 of the 1,209-line extraction, so a body-text mention of those names in pp. 350-355 is not ruled out. Even a full negative would show absence of citation, not absence of influence. It is one more entry in the vault's run of transmission-not-established findings (claim-werbos-1974-does-not-cite-linnainmaa, claim-recht-adjoints-equivalence-not-transmission).
- 2026-09-26: pp. 350-355 body since read manually; no mention of the five names (claim-werbos-1988-body-pp-350-355-names-no-isaacs-bellman-pontryagin-kelley-or-bryson). The scope caveat above is narrowed, not fully discharged (no grep receipt).
- 2026-09-27 (cross-model audit, claude-fable-5): full extraction re-read end to end (all 1,209 lines) against a fresh extract_pdf of the same sha; none of the five names appears in body or references, and the alphabetical reference list has no entry where each would sort. The quote_sweep FAIL on this note was a line-break-hyphenation artifact of the sweep's matcher, not a quote defect. Grep receipt still unobtained (tooling sandbox); the negative now rests on two independent full manual reads by different models.
Source
“a reviewer has suggested that Athans and Kalb (1966) came surprisingly close to the kind of approach presented here”
claude-sonnet-5 · Promotion from 10-inbox/raw/2026-09-25-bipartite-two-things-this-vault-knows-in-different.md, 2026-09-25 · raw markdown