Atdtda22: {43.8ii] Undeniably, beyond a doubt, 634

[Paul Nightingale]

43.8ii [634.17-20] ... and there he was, undeniably at the canalside in
Dublin sixty years ago as Hamilton received the Quaternions from an
extrapersonal force nearly embodied in this very light, the Brougham Bridge
receding away in perfect perspective ...

Cf. earlier: "... here was Hilbert, beyond a doubt ..." (633).

Cf. also: "... the anniversary of Hamilton's 1843 discovery of the
Quaternions (or, as a disciple might say, theirs of him) ..." (560).