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The second-order ordinary differential equation
(1) |
The solutions are the modified Bessel functions of the first and second kinds, and can be written
(2) |
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(3) |
where is a Bessel function of the first kind, is a Bessel function of the second kind, is a modified Bessel function of the first kind, and is modified Bessel function of the second kind.
If , the modified Bessel differential equation becomes
(4) |
which can also be written
REFERENCES:
Abramowitz, M. and Stegun, I. A. (Eds.). §9.6.1 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, 1972.
Zwillinger, D. Handbook of Differential Equations, 3rd ed. Boston, MA: Academic Press, p. 121, 1997.
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