Hrm... Ambiguity only arises out of context. IMHO, there is ample enough context here to disambiguate, just as you seem to have successfully done. Matrix diago

Hrm... Ambiguity only arises out of context. IMHO, there is ample enough context here to disambiguate, just as you seem to have successfully done. Matrix diagonalization and what you're calling Cantor's diagonalization can both be seen as instantiations of a more general diagonalization process. This latter process seems to be what the article is obliquely pointing at, cf my top-level comment for a video that introduces those details.