Cunningham Function
The Cunningham function, sometimes also called the Pearson-Cunningham function, can be expressed using Whittaker functions (Whittaker and Watson 1990, p. 353).
where U(a,b,z) is a confluent hypergeometric function of the second kind (Abramowitz and Stegun 1972, p. 510).
See also
Confluent Hypergeometric Function of the Second Kind, Whittaker FunctionExplore with Wolfram|Alpha
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References
Abramowitz, M. and Stegun, I. A. (Eds.). Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, 1972.Whittaker, E. T. and Watson, G. N. A Course in Modern Analysis, 4th ed. Cambridge, England: Cambridge University Press, 1990.Referenced on Wolfram|Alpha
Cunningham FunctionCite this as:
Weisstein, Eric W. "Cunningham Function." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/CunninghamFunction.html