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Date: 30-3-2019
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Date: 2-5-2019
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Date: 30-7-2019
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The function is defined as the imaginary part of
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(1) |
where is a modified Bessel function of the second kind. Therefore,
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(2) |
where is the imaginary part.
It is implemented as KelvinKei[nu, z].
has a complicated series given by Abramowitz and Stegun (1972, p. 380).
The special case is commonly denoted
and has the plot shown above.
has the series expansion
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(3) |
where is the digamma function (Abramowitz and Stegun 1972, p. 380).
REFERENCES:
Abramowitz, M. and Stegun, I. A. (Eds.). "Kelvin Functions." §9.9 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, pp. 379-381, 1972.
Prudnikov, A. P.; Marichev, O. I.; and Brychkov, Yu. A. "The Kelvin Functions ,
,
and
." §1.7 in Integrals and Series, Vol. 3: More Special Functions. Newark, NJ: Gordon and Breach, pp. 29-30, 1990.
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