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ENTIRE FUNCTIONS OF IRREGULAR GROWTH TAKE EVERY VALUE J. M. WHITTAKER The following result will be established: THEOREM. Let p, X, p be the order, lower order and exponent of convergence of the zeros of an entire function. Then p = max (X, p ). (1) COROLLARY. NO value is exceptional B for an entire function of irregular growth. In this proposition some, or all, of p , X, p may be infinite. Denote the right-hand side of (1) by fx. Since X ^ p,p ^ p in all cases, \i ^ p and (1) is certainly true if X or p is infinite; so we may take them to be finite. Dividing /(z) , if necessary, by z we may suppose that/(0 ) # 0 and can then write/(z) in the form P(z) exp {Q{z)}, where P(z) is a canonical product of order p and Q(z) is entire. It is familiar [1; 273] that if we surround the zeros z of P(z) with circles of radii \z \~ , whereh > p then p u 1+ \P(z)\ > exp (-r" « ) (|z| = r > r (e)) in the region excluded from the circles. Enclose the circles
Bulletin of the London Mathematical Society – Wiley
Published: Jul 1, 1972
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