Linnainmaa citation histogram vs OSTI SAND-91-7095 metadata (cosine 0.84): a false friend with one narrow shared property — both are readings of an aggregator's record layer, and each aggregator's encoding limits the claim

bipartitefalse-friendbibliometricsmetadatasemantic-scholarostiembeddings

Bridge-seed check: no sibling capture in 10-inbox/raw/ mentions both slugs (the histogram note appears in three captures, the OSTI note in one; none together). Investigated fresh.

Notes compared: claim-linnainmaa-1976-citation-histogram and claim-osti-structured-metadata-confirms-sand91-7095-january-1992. Context: claim-sand91-7095-predates-1993-mpm-founding-report, claim-ml-and-ad-communities-mutually-unaware, and the vault's prior false-friend rulings observation-gates-jevons-cosine-pairing-is-embedding-false-friend, observation-greenhalgh-2003-klensin-romberg-1989-cosine-pairing-is-embedding-false-friend, observation-ml-ad-en-gedi-cosine-pairing-is-embedding-false-friend.

Verdict: false friend, with a narrow real kernel (below). No shared subject, people, or field: one is a count of citing papers over time; the other is the date field of a single catalog record. The historical thread that could have linked them by content — entity-howard-schreyer / entity-deborah-sulsky / entity-zhen-chen (material point method) versus Linnainmaa (automatic differentiation) — is a different question already covered by claim-ml-and-ad-communities-mutually-unaware.

Discriminating test (per the Gates/Jevons precedent): does the claim rest on the same evidentiary act? It does not. The histogram is an aggregation over many records (a count), whose weakness is corpus coverage. The OSTI claim is a reading of one record's field, whose weakness is field precision and rendering.

Claim: Semantic Scholar's Linnainmaa count is a snapshot of a curated, moving index (quantitative)

claim_kind: quantitative verifies: (none — no named question)

• source_url: https://api.semanticscholar.org/graph/v1/paper/DOI:10.1007/BF01931367?fields=title,year,citationCount,venue,authors
• source_sha: b00e4b8bfe0ffefa8b0afc9bdf620b41e6c39526aff2b6e7ffd36290212faad8
• source_author: Semantic Scholar Graph API (Allen Institute for AI); record for S. Linnainmaa
• source_date: queried 2026-09-25
• source_title: "Taylor expansion of the accumulated rounding error" (record title, verbatim from API)
• source_venue: Semantic Scholar Academic Graph API (Allen Institute for AI)
• source_quote: "title": "Taylor expansion of the accumulated rounding error", ... "year": 1976, "citationCount": 314
• source_tier: 1 (primary: the index's own record; says nothing about total true citations)

The live API returns citationCount: 314 on 2026-09-25; the vault's histogram note recorded 305 records on 2026-07-07. The count rose by 9 in ~11 weeks, so the "245 since 2010" and 60%-after-2020 shares are dated snapshot figures, not fixed properties of the paper. (Arithmetic on two dated observations; the 305 figure comes from the vault note, not re-pulled here.) Also, the per-decade histogram requires the /citations endpoint, which was not re-run this session — I did not re-verify the 51/245 split.

Claim: OSTI's "Dec 31 1991" timestamp is consistent with UTC-midnight first-of-month dates rendered in US Eastern time (mechanism)

claim_kind: technical-mechanism (inferred from the record's own rendering; OSTI documentation of its date storage NOT located)

• source_url: https://www.osti.gov/biblio/5900384
• source_sha: f96ee695b0188840ef1d522ddaea2e68c462a6f26b578a6a0e0ae563953a160e
• source_author: Sulsky, D; Chen, Zhen; Schreyer, H L (record authors); catalog by OSTI, U.S. DOE
• source_date: 1992 (catalog year); page read 2026-09-25
• source_title: "The application of a material-spatial numerical method to penetration"
• source_venue: OSTI.GOV, U.S. Department of Energy Office of Scientific and Technical Information; Sandia National Laboratories report SAND-91-7095
• source_quote: "Technical Report·Wed Jan 01 00:00:00 EST 1992" ; "@techreport{osti_5900384, ... year = {1992}, month = {01}}" ; similar-records: "Tue Dec 31 19:00:00 EST 1991", "Fri Apr 30 20:00:00 EDT 1993", "Mon May 31 20:00:00 EDT 1993"
• source_tier: 1 for what the record displays; the storage mechanism is [unverified-mechanism -- needs primary]

Every date in the Similar Records sidebar falls on the last day of a month at 19:00 EST / 20:00 EDT — exactly 00:00 UTC on the first of the next month (Dec 31 19:00 EST = Jan 1 00:00 UTC; Apr 30 20:00 EDT = May 1 00:00 UTC; May 31 20:00 EDT = Jun 1 00:00 UTC). That pattern across three unrelated records supports the vault's earlier "display artifact" reading and indicates month-level (not day-level) resolution. This strengthens, without contradicting, the existing OSTI note; note that the note's "five-hour offset" is precisely the EST–UTC offset, and the 1993 EDT items show a four-hour offset, which is the same artifact under daylight time. Mechanism remains inference from displayed strings, hence the flag.

Claim: The one shared property is that each is a reading of an aggregator's encoding, so each conclusion inherits the aggregator's limits (synthesis)

claim_kind: synthesis, no new fact

• Histogram inherits index coverage limits (Semantic Scholar is a curated corpus; the histogram note already flags a Google Scholar 1247 figure as [unverified-quant]).
• OSTI inherits precision/rendering limits (month-level dates, UTC-to-local display).
• This is a generic property of any database-derived number or date and does not discriminate these two notes from thousands of others; it does not warrant a wikilink between them. The 0.84 cosine most plausibly reflects shared register ("independently confirms", "primary record", "structured", machine-readable fields, counts and dates), the same failure mode as the earlier false-friend observations.

Further leads

• OSTI documentation on how dates are stored/exported (would move the timezone mechanism above from inference to Tier 1).
• Re-pull /citations?fields=year for the Linnainmaa DOI to see whether the decade histogram shifted with the 305→314 change (Semantic Scholar API docs).
• Whether the 9 new citations since July are 2026 papers (would test the "resurrection curve" reading).

Entity candidates

• Seppo Linnainmaa — person — the foundational figure whose 1976 paper the histogram measures; priority claim rests on him.
• Howard Schreyer — person — SAND-91-7095 co-author; the OSTI note's subject.
• Deborah Sulsky — person — SAND-91-7095 lead author, material point method.
• Zhen Chen — person — SAND-91-7095 co-author.
• Semantic Scholar Academic Graph API — term — curated citation index underlying the histogram; count drifted 305→314.
• OSTI.GOV — term — DOE catalog whose date rendering shows the UTC-midnight artifact.
• UTC-midnight rendering artifact — concept — explains "Dec 31 19:00 EST" entries for month-level dates.
• Embedding false friend — concept — fifth-ish instance; resemblance of register, not mechanism.