David Simms was an Irish Mathematician based at Trinity College Dublin.
On Lie groups and quantum mechanics (cf. Gruppenpest):
(with an eye towards quantum mechanics, cf. Gruppenpest – beware of the false claim on p. 10 that U(ℋ) is not a topological group in the strong operator topology, corrected by Schottenloher 2013, Espinoza & Uribe 2014, going back to Schottenloher 1995, but repeated by Atiyah & Segal 2004)
On the topoloy of PU(ℋ) (the projective unitary group on a separable Hilbert space):
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