FM

DumboFixer

Joined Feb 10, 2009
217
There's a really useful facility available - it's called Google. Give it a try and then come back with any questions.
 

Papabravo

Joined Feb 24, 2006
12,297
Bessel Functions are the solutions to a particular differential equation. They are non-elementary functions which can be approximated with and infinite series.

http://en.wikipedia.org/wiki/Bessel_function

The other name for them is cylinder functions (Zylinderfunktionen), because they are the solutions to Laplace's equation in cylindrical coordinates.
 
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