References : http://mathforum.org/kb/message.jspa?messageID=342551&tstart=0, https://mathoverflow.net/questions/12828/inverse-gamma-function
The inverse factorial function.
Published
References : http://mathforum.org/kb/message.jspa?messageID=342551&tstart=0, https://mathoverflow.net/questions/12828/inverse-gamma-function
Random thought modules. 