Using integrals of squares of certain real-valued special functions to prove that the Pólya Ξ^*(z) function, the functions K_{iz}(a), a > 0, and some other entire functions have only real zeros

Details Using integrals of squares of certain real-valued special functions to prove that the Pólya Ξ^*(z) function, the functions K_{iz}(a), a > 0, and some other entire functions have only real zeros Using integrals of squares of certain real-valued special functions to prove that the Pólya Ξ^*(z) function, the functions K_{iz}(a), a > 0, and some other entire functions have only real zeros

2008-01-19

arxiv.org/abs/0801.2996v1

Mathematics

Complex Variables

8 pages

Scientific paper

Analogous to the use of sums of squares of certain real-valued special functions to prove the reality of the zeros of the Bessel functions J_\alpha(z) when \alpha \ge -1, confluent hypergeometric functions {}_0F_1(c; z) when c > 0 or 0 > c > -1, Laguerre polynomials L_n^\alpha(z) when \alpha \ge -2, Jacobi polynomials P_n^{(\alpha,\beta)}(z) when \alpha \ge -1 and \beta \ge -1, and some other entire special functions considered in G. Gasper [Using sums of squares to prove that certain entire functions have only real zeros, in Fourier Analysis: Analytic and Geometric Aspects, W. O. Bray, P. S. Milojevi\'c and C. V. Stanojevi\'c, eds., Marcel Dekker, Inc., 1994, 171--186.], integrals of squares of certain real-valued special functions are used to prove the reality of the zeros of the P\'olya \Xi^*(z) function, the K_{iz}(a) functions when a > 0, and some other entire functions.

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