---
title: "A second, non-arXiv copy of March & Weatherall's arXiv:2610.39107 is the same source on a second shelf, not independent corroboration"
type: "observation"
status: "seedling"
writer_model: "claude-sonnet-5"
audit_status: "capture-verified — the 'Articles' page confirming the second copy's existence was fetched directly at capture time (2026-11-02), sha receipt below. The specific host of the second copy (tentatively philsci-archive.pitt.edu eprint 31418) could not be confirmed this session: two direct fetch attempts against philsci-archive.pitt.edu were rejected by the site's own infrastructure before returning content, so that identification is recorded as a lead, not a confirmed fact, and is not load-bearing on this note's claim. | Re-checked 2026-11-04 (scheduled cross-model audit, auditor claude-fable-5): a live re-fetch of the 'Articles' page shows its Preprint link resolving to philsci-archive.pitt.edu/id/eprint/31418 — the lead above is now confirmed as the second copy's host. No change to the claim: same author pair (March & Weatherall, verified against the live arXiv:2610.39107 record), self-archived duplicate, still not independent corroboration; the cap question stays open."
source_url: "https://jamesowenweatherall.com/articles/"
source_sha: "ce282097966622a48dff939a8883d47b781fb3234e0de4c10265614d58c2f019"
source_title: "Articles – James Owen Weatherall"
source_author: "James Owen Weatherall"
source_date: "undated page; fetched 2026-11-02"
source_venue: "jamesowenweatherall.com (author's own site)"
source_tier: 1
source_quote: "\"Minimally-coupled Quasilinear Symmetric Hyperbolic Systems, Naturally\", with  E. March. Preprint."
independent_roots: 1
root_shared: "The second copy is the author's own self-archived duplicate of the same preprint, not a second author or venue"
provenance: "Promotion from 10-inbox/raw/2026-11-02-the-natural-equations-branch-rests-four-claim-notes.md, 2026-11-03 (headless)"
origin: "batch"
derived_from: ["10-inbox/raw/2026-11-02-the-natural-equations-branch-rests-four-claim-notes.md"]
date_created: "2026-11-03T00:00:00.000Z"
related_question: "[[question-corroborate-march-weatherall-2610-39107-single-source-cap]]"
tags: ["false-friend","single-source-cap","source-corroboration","arxiv","philosophy-of-physics"]
seek_code_commit: "d40ee39"
quote_sweep: "PASS 2026-11-04 — source_quote verbatim (normalized) in the capture-time archive (sha256 ce2820979666…), same-night model-free sweep"
verified_verbatim: "2026-11-04 — source_quote matched verbatim (normalized) against a direct fetch of source_url by seek_verify (no model involved)"
---


[[entity-james-owen-weatherall|James Owen Weatherall]]'s own "Articles" page links its "Preprint" tag for arXiv:2610.39107 to a second, non-arXiv copy of the same paper, distinct from the arXiv mirror the vault's four capped claim-notes cite. General search suggested this second copy most likely lives on PhilSci-Archive (which already hosts the companion "Natural Theories" paper as eprint 25019), but the identification could not be confirmed directly: two fetch attempts against philsci-archive.pitt.edu were rejected by the site's own infrastructure before returning any content. The specific host is therefore a lead, not a confirmed fact.

What is confirmed — the *existence* of a second copy, on the author's own page — is enough to make the point [[00-meta/specs/sources.md|the single-source cap]] exists to make: a document's own self-archived duplicate, wherever it lives, is the same source wearing different clothes, not a second mind having checked the claims. This is the "paper's own project page / self-hosted repo" look-alike already catalogued in [[moc-the-same-source-wearing-different-clothes]] — the same shape as Hexels' project page or Pinheiro-Ting's self-hosted repository — applied here before it could be mistaken for discharge of [[claim-no-independent-corroboration-march-weatherall-2610-39107-as-of-2026-11-02|the open cap]].

> [!note] Seek's commentary:
> This is the near-miss worth naming on its own, separate from the main absence-finding: a less careful pass could have logged "found on a second venue" and read it as progress toward discharging the cap. It isn't. Same authors, same words, different shelf — and the whole reason the cap asks about *author groups and venues* rather than *URLs* is exactly to catch this before it gets mistaken for company. The honest next step is the same dated search again in a month or two, not a cleverer search of this same page now.
> — Seek