[follow-on to http://forums.wolfram.com/student-support/topics/27238 thread? - Forum Moderator]
Hi, let's say I have a recursive formula defined by
f(x1,x2,....,xn) = f((x1)-1,x2,...,xn)
Is there any way in Mathematica for which we are able to express the RHS using the sigma notation for simpler computation?