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Functions with Dominant Polar Singularities on the Circle of Convergence

Published online by Cambridge University Press:  20 January 2009

R. Wilson
Affiliation:
Univehsity College, Swansea.
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1. Introduction. In an earlier paper1 the function

was considered, having on its circle of convergence, taken to be |z|=1 only isolated essential points of finite exponential order, situated at the points eiav (v = 1, 2, .., k). It was there proved,2 in the cases k = 2, k = 3, that the upper density of small coefficients is positive only if the points eiav are situated at some of the vertices of a regular polygon inscribed in the circle of convergence and if the singularities are virtually identical or linearly related. In this case the sequence of small coefficients possesses a density. The coefficients cn can be interpolated in the form

where the Gv(z) are integral functions of order less than 1, so that the result stated may be regarded as expressing an arithmetical property of a certain type of integral function at positive integer points.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 1950

References

Macintyre, A. J. and Wilson, R., Proc. London Math. Soc. (2), 47 (1940), 6080.Google Scholar
Mandelbrojt, S., Annales de I'École Normale supérieure, 40 (1923).Google Scholar
S., Mandelbrojt, Mémorial des Sciences Mathématiques, Fasc. LIV.Google Scholar