Abstract
The following note was written in 1949 as a supplement to the official course of reading for students preparing to take Part IA of the Institute's examinations and is issued in duplicated form to students by the Actuarial Tuition Service. The editors feel that the note may be of interest to many who, like themselves, did not have the opportunity of reading it in the course of their studies; those more recent students who have read the note may like to refresh their memories.Mr Perks has kindly given permission for publication, and wishes to express his thanks to H. W. Haycocks and G. V. Bayley for the helpful criticisms and suggestions that he received from them.
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