Try the function F(x,y) = (x+y) or F(x,y) = x*y would be the simplest that come to mind.

On 8/5/2011 11:35 AM, LU Tb wrote:
Hi!
I have a problem, anyone can help me.
does exist a function F with the following property:
F(F(X1,X2,......Xi-1,Xi,Xi+1,Xi+2,......,Xn),Xi)=F(X1,X2,......Xi-1,Xi,Xi+1,Xi+2,......,Xn)
thank you!
Tbo  LU


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