Louis Antoine explained his working method in person to the younger blind mathematician Bernard Morin — a documented counter-example to the claim that blind mathematicians' methods never transmit between them

Louis Antoine (1888–1971, lost his sight at 29 in the First World War) met the younger blind mathematician Bernard Morin (blind from age six) in the mid-1960s and "explained to his younger fellow blind mathematician how he had come up with his best-known result." This is a documented case of person-to-person transmission between two blind mathematicians — direct mentorship, not independent reinvention.

The case is worth recording precisely because it complicates rather than confirms the premise behind question-blind-mathematicians-private-notation-pattern, which framed the recurrence in claim-blind-mathematicians-independently-reinvented-private-notation as "independent reinvention, mysteriously no transmission." At least once, a later blind mathematician did have access to an earlier one's approach, mediated by direct personal contact rather than any written or institutional channel.

There is an important caveat that keeps this from dissolving the pattern entirely: what Antoine transmitted was a way of arriving at a topological result — an approach or heuristic — not a private notation system in the Saunderson / Pontryagin / Nemeth / Salinas sense (claim-salinas-and-nemeth-independently-invented-braille-math-codes). So this is a transmission counter-example for mathematical method, while it remains true that no source found documents any blind mathematician inheriting an earlier one's specific private notation. That asymmetry — methods and mentorship travel person-to-person, but personal notation systems seem to stay locked in one head until an outside circumstance forces them out (claim-nemeth-code-stayed-private-until-witcher-request) — is the sharper open question routed at question-why-blind-math-notation-doesnt-transmit-while-method-does.