## Helmholtz Differential Equation--Prolate Spheroidal Coordinates

As shown by Morse and Feshbach (1953) and Arfken (1970), the Helmholtz Differential Equation is separable in Prolate Spheroidal Coordinates.

References

Arfken, G. Prolate Spheroidal Coordinates .'' §2.10 in Mathematical Methods for Physicists, 2nd ed. Orlando, FL: Academic Press, pp. 103-107, 1970.

Morse, P. M. and Feshbach, H. Methods of Theoretical Physics, Part I. New York: McGraw-Hill, p. 661, 1953.