Does the philosophy-of-science or citation-analysis literature already name the specific in-between category the vault keeps rediscovering — two investigations that share a method but not a referent or a shared story?

philosophy-of-sciencecitation-analysisargument-from-silencecomparative-historystructural-equivalencebibliometricscross-domain-bridgemethodologynegative-citation

observation-brooks-dreyfus-forgetting-bridge-is-method-level-not-mechanism-level's own commentary names the gap directly: "I keep wanting a name for this middle category and keep talking myself out of minting one before there's a third instance to justify it." That note, and the neighboring claim-organizational-forgetting-names-two-unrelated-research-traditions, sit in the same place on the vault's own spectrum — real shared method (exhaustive negative-citation enumeration), no shared referent or story — bracketed by moc-argument-from-silence's confirmed-bridge pole (one causal story, e.g. the Puckette pairing) and its false-friend pole (Hawks/Jeffress, shared surface only). This capture asks whether an existing literature, rather than the vault's own synthesis, already has a name for that middle position.

The direct answer: no source found names the vault's precise configuration — two investigations (not two objects in a shared network, not one scholar's deliberate demonstration) that apply the identical method to unconnected referents. But two adjacent, well-documented, decades-old technical categories exist one field over, and between them they cover two of the vault's three poles. The core question is marked [unverified — could not confirm or deny after search]: the closest matches are recorded below, honestly scoped as close-but-not-exact.

Claim: Comparative-historical sociology names the closest external analogue to the vault's in-between category — "the parallel demonstration of theory" (Skocpol & Somers, 1980)

Claim type: definitional/historical (naming an existing, decades-old scholarly category). Floor: Tier 3-4 acceptable; met at Tier 1 (primary, directly read).

Skocpol and Somers's methodological paper distinguishes three "logics-in-use" of comparative history, one of which is built for exactly the shape the vault keeps finding: cases juxtaposed not because they are causally or historically connected, but because the same explanatory theory or method demonstrably applies to each of them independently. Verbatim: "Notwithstanding such attempts at homogenization, there are, in fact, at least three distinct logics-in-use of comparative history. One of them, which we shall label comparative history as macro-causal analysis, actually does resemble multivariate hypothesis-testing. But in addition there are two other major types: comparative history as the parallel demonstration of theory; and comparative history as the contrast of contexts." The paper's worked examples (Eisenstadt's The Political Systems of Empires; Paige's Agrarian Revolution) apply one theoretical framework across historically unconnected cases — ancient empires from Egypt to Byzantium in Eisenstadt's case — specifically to demonstrate the framework's reach, not to claim the cases share a history.

This is the closest documented category to the vault's Brooks/Dreyfus-and-forgetting bridge: both are instances of one analytic apparatus (there, a theory; here, exhaustive negative-citation enumeration) proving itself repeatable across unconnected material. It is not an exact match: Skocpol & Somers describe a single scholar's deliberate rhetorical strategy — choosing multiple cases on purpose to make a persuasive case for one theory — while the vault's bridges are two separate, independently motivated investigations that happen to share a method, with no author trying to demonstrate anything by juxtaposing them.

Claim: The same 1980 typology also names the vault's other already-established pole, sharpening why the middle category is genuinely distinct from both

Claim type: definitional/historical. Floor: Tier 3-4 acceptable; met at Tier 1.

The same paper's first-named type, "macro-causal analysis," is the type built for cases that are causally or historically linked — the pole observation-puckette-dataflow-claims-confirmed-bridge-not-false-friend already occupies in the vault's own grading (one author's premise and conclusion in one document). Skocpol & Somers, discussing Barrington Moore's Social Origins of Dictatorship and Democracy as their exemplar: "Macro-analytic comparative historians proceed by selecting or referring to aspects of historical cases in order to set up approximations to controlled comparisons." That is a different operation from parallel demonstration: the cases are read against each other to isolate a cause, not read alongside each other to show one theory holds repeatedly.

Having independent, external names for two of the vault's three poles — the causally-connected pole ("macro-causal analysis") and the middle, method-sharing-without-referent-sharing pole ("parallel demonstration of theory") — from the same single source is a useful confirmation that the vault's three-part spectrum is not an artifact of its own vocabulary. It does not, however, extend to the third pole: Skocpol & Somers's remaining type, "contrast of contexts," compares cases to highlight their differences under a chosen frame, which is not the same operation as the vault's false-friend pole (observation-hawks-jeffress-cosine-pairing-is-embedding-false-friend, accidental surface echo with no real shared method at all). No claim is made here that "contrast of contexts" names the false-friend pole; the two remaining poles line up, the third does not.

Claim: Citation-analysis and social-network-analysis literature has its own, older, more narrowly on-topic term — "structural equivalence" (Lorrain & White, 1971) — but it describes network position, not investigative method, and is also not an exact match

Claim type: definitional, with an attached technical-mechanism claim. Floor: Tier 1-2 required for the mechanism. Source tier met: 1.

Lorrain and White's foundational social-network-analysis paper defines structural equivalence formally: "Objects a, b of a category C are structurally equivalent if, for any morphism M and any object x of C, aMx if and only if bMx, and xMa if and only if xMb. In other words, a is structurally equivalent to b if a relates to every object x of C in exactly the same ways as b does. From the point of view of the logic of the structure, then, a and b are absolutely equivalent, they are substitutable." Two nodes can share an identical relational pattern to everything else in a network without ever being tied to each other directly — on its face, a strong candidate for "same method [relational pattern], different referent [no direct tie]."

This term has been explicitly imported into citation analysis itself. Chen (2019), applying it to a journal-citation network, writes: "Since the seminal works published by Doreian (1985) and Doreian and Fararo (1985), the SNA's structural equivalence approach has been employed to investigate whether journals are equivalent to neighbours, that is, they have exactly the same pattern of sending and receiving citations in a J2J network." Chen also directly quotes Lorrain & White's definition (p.63) — independently re-verified here against Lorrain & White's own text and found to match exactly.

The mismatch with the vault's category is structural in the technical sense of the word: "structural equivalence" is a property of two nodes inside one shared, already-existing network (here, a citation network where every journal already has ties to every other), established formally via a "reduction" of that network — Lorrain & White note explicitly that "In most social networks... no two distinct objects are structurally equivalent. Structural equivalence of nodes usually appears only once a reduction of the morphisms of [the network] has been accomplished." The vault's Brooks/Dreyfus and forgetting bridges are not two nodes inside one network being compared for equivalent position; they are two separate research projects, run on two disconnected citation neighborhoods, that happen to use the same investigative technique. The term names a real, older, citation-analysis-native category — and it is not the vault's category either.

Further leads

• Ian Hacking's "styles of scientific reasoning" (from 1982, building on A. C. Crombie) — a broader philosophy-of-science concept for a style (a way of finding things out — statistical, taxonomic, postulational, etc.) recurring across otherwise unconnected scientific domains without those domains being causally linked. Surfaced only via WebSearch synthesis of secondary discussions this session, not read against Hacking's own primary text — worth a direct-primary-source chase in a future session, since of everything found it is conceptually the closest to "same method, unconnected domains" at the general philosophy-of-science (rather than comparative-sociology or bibliometrics) level the topic asked about.
• Doreian, P. (1985), "Structural equivalence in a psychology journal network," Journal of the American Society for Information Science 36:411-417, and Doreian, P. & Fararo, T. (1985), "Structural equivalence in a journal network," JASIS 36(1):28-37 — the founding citation-analysis application papers Chen (2019) credits; both appear to be Wiley-paywalled, no free full text located this session.
• McCain, K. W. (1990), "Mapping authors in intellectual space: A technical overview," JASIS 41:433-443 — a further citation-analysis application of structural equivalence to author co-citation networks; Wiley-paywalled, not read this session.
• Wittgenstein's "family resemblance" (Philosophical Investigations, 1953) — considered as a candidate for "things connected by overlapping similarities with no single essential common feature," but it names a relationship among concepts (e.g., "game"), not a relationship between two investigations; judged a looser fit and not chased to primary text this session.
• Robert Yin's case-study "literal replication" vs. "theoretical replication" logic (multiple-case case-study design) — a further comparative-method vocabulary pair, adjacent but not directly chased this session; may be worth checking against the vault's category in a future pass.

Entity candidates

• S. F. Nadel — person — flagged first per the ancestry rule: Lorrain & White's own paper credits Nadel's 1957 formulation of role theory as "a brilliant formulation of the problem" their algebraic treatment of structural equivalence was built to extend; the older figure the 1971 innovation is measured against.
• Barrington Moore, Jr. — person — Skocpol & Somers's own named "dean" of macro-causal comparative history (Social Origins of Dictatorship and Democracy), the foundational exemplar their "macro-causal analysis" category is built to describe.
• Theda Skocpol — person — co-author of the 1980 typology naming both "parallel demonstration of theory" and "macro-causal analysis"; major figure in comparative-historical sociology.
• Margaret Somers — person — co-author of the same 1980 paper.
• S. N. Eisenstadt — person — the paper's own worked example of "parallel demonstration of theory" (The Political Systems of Empires).
• Jeffery M. Paige — person — the paper's second worked example (Agrarian Revolution).
• François Lorrain — person — co-originator of "structural equivalence" (1971).
• Harrison C. White — person — co-originator; Harvard network-analysis program that later produced much of the structural-equivalence/blockmodeling literature bibliometrics draws on.
• Patrick Doreian — person — brought structural equivalence into citation-network/bibliometric analysis specifically (1985), the bridge from social-network-analysis theory to citation-analysis application.
• Ya-Ning Chen — person — 2019 author applying structural equivalence directly to a citation network; source for the citation-analysis-literature confirmation above.
• Structural equivalence — concept — candidate hub; the citation-analysis/social-network-analysis-native term nearest to the vault's category, with a clean formal definition and a documented citation-analysis lineage (Lorrain & White → Doreian → Chen).
• Parallel demonstration of theory — concept — candidate hub; the comparative-historical-sociology term nearest to the vault's category, paired against "macro-causal analysis" from the same source.