Tertius Chandler argued that most 'simultaneous discoveries' are incremental repackagings of prior work, not independent breakthroughs

In secondary literature on the Merton / Ogburn–Thomas tradition of multiple independent discovery, Tertius Chandler is cited as a skeptic of the independence claim: on this account "simultaneous discoveries are not really new discoveries, but rather are mere repackagings or incremental improvements on a prior discovery." The illustration the summary pairs with his thesis is Darwin and Wallace's evolution by natural selection, which both built on Thomas Malthus's population-pressure economics — so, on Chandler's reading, the "independent" convergence is really shared descent from a common prior. (The summary's Malthus passage is itself quoted from a Berkeley source, not given as Chandler's own words.)

The thesis is a direct rival to the standard multiple-discovery frame the vault applies to its own history threads, where the reverse mode of differentiation was reached separately across five fields (see backpropagation-gap and moc-backpropagation-origins). Chandler's move is to reclassify such cases as delayed transmission or incrementalism rather than genuine independence — the same reclassification debated under priority-not-paternity.

The attribution is weakly grounded. It survives here only through a single Tier-3 secondary summary; no link to Chandler's own primary statement of the argument has been located, and the summary's "Tertius Chandler, of the University of California" is not independently confirmed to be the same person as the urban historian of the companion notes. Both gaps are routed to question-verify-chandler-multiple-discovery-thesis-and-identity. The note stays seedling until a primary is read. Chandler's transmissionist thesis is enacted, not just stated, in claim-dreyfus-1973-lineage-link-uncorroborated — where a constructed descent link goes uncorroborated by the cited party; the shared sociology-of-credit frame is drawn in 2026-07-11-hop-credit-assignment-two-senses.