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Mathematics of Computation
Mathematics of Computation
ISSN 1088-6842(online) ISSN 0025-5718(print)

An upper bound for the first zero of Bessel functions


Author: Ll. G. Chambers
Journal: Math. Comp. 38 (1982), 589-591
MSC: Primary 33A65
MathSciNet review: 645673
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Abstract: It is shown, using the Rayleigh-Ritz method of the calculus of variations, that an upper bound for the first zero $ {j_v}$, of $ {z^{ - v}}{J_v}(z)$, $ v > - 1$, is given by

$\displaystyle {(v + 1)^{1/2}}\{ {(v + 2)^{1/2}} + 1\} ,$

and that for large v, $ v,{j_v} = v + O({v^{1/2}})$.

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Additional Information

DOI: http://dx.doi.org/10.1090/S0025-5718-1982-0645673-0
PII: S 0025-5718(1982)0645673-0
Article copyright: © Copyright 1982 American Mathematical Society