Among the infinitesimal operators of the 3 + 2 de Sitter group, there are four independent cyclic ones, one of which is separate from the other three. A representation is obtained for which this one has integral eigenvalues while the other three have half‐odd eigenvalues, or vice versa. The representation is of a specially simple kind, with the wavefunctions involving only two variables.

1.
J. B.
Ehrman
,
Proc. Cambridge Phil. Soc.
53
,
290
(
1957
).
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