Positive Integrals of Bessel Functions
Positive Integrals of Bessel Functions
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贝塞尔函数的正积分
DOI:
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发表时间:
1975
期刊:
影响因子:
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通讯作者:
G. Gasper
中科院分区:
文献类型:
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作者:
G. Gasper
It is shown that some new and some already known positivity results for integrals of Bessel functions and for generalized hypergeometric functions can be easily obtained by writing the integrals and functions either as a sum of squares of Bessel functions with positive coefficients or as a fractional integral of such a sum. In particular, this method is used to prove that $int_0^x {(x - t)^lambda t^{lambda + {1 / 2}} J_alpha (t)dt > 0,quad 0 leqq lambda leqq alpha - {1 / 2},quad alpha > 1/2, quad x > 0,} $ and to give a simple proof of Steinig’s recent result that the Lommel function $S_{mu ,
u } (x) > 0$ for $x > 0$ if, $mu = {1 / 2}$ and $ - {1 / 2} {1 / 2}$ and $ - mu leqq
u leqq mu $.