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Published online by Cambridge University Press: 24 October 2008
Let F(z) be a rational function of z which is regular at z = 0 and so possesses a convergent power series
The problem arises of characterizing those rational functions F(z) that have infinitely many vanishing Taylor coefficients fh. After earlier and more special results by Siegel(2) and Ward(4) I applied in 1934(1) a p-adic method due to Skolem(3) to the problem and obtained the following partial solution.