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Published online by Cambridge University Press: 24 October 2008
1. A paper with the same title was published with Professor H. F. Baker in 1920; that paper was severely compact and would seem to deserve elucidation, more detail, and some revision. We use a symbolism which, while leaving the proofs geometrical, readily converts itself into ordinary analysis, as we shall show in § 12.
* Proc. Cambridge Phil. Soc. 20 (1921), 155–7.Google Scholar
