Mathematics – Classical Analysis and ODEs
Scientific paper
2012-02-22
Mathematics
Classical Analysis and ODEs
21 pages, 3 figures
Scientific paper
Motivated by some applications in applied mathematics, biology, chemistry, physics and engineering sciences, new tight Tur\'an type inequalities for modified Bessel functions of the first and second kind are deduced. These inequalities provide sharp lower and upper bounds for the Tur\'anian of modified Bessel functions of the first and second kind, and in most cases the relative errors of the bounds tend to zero as the argument tends to infinity. The chief tools in our proofs are some ideas of Gronwall [19], an integral representation of Ismail [28,29] for the quotient of modified Bessel functions of the second kind, results of Hartman and Watson [24,26,59] and some recent results of Segura [52]. As applications of the main results some sharp Tur\'an type inequalities are presented for the product of modified Bessel functions of the first and second kind and it is shown that this product is strictly geometrically concave.
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