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# i have a function f:R^4-R^4, f(x,y,z,t)= (|x-y|,|y-z|,|z-t|,...

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 Question by dorothy Submitted on 3/31/2007 Related FAQ: sci.math FAQ: f(x)^f(x)=x Rating: Not yet rated Rate this question: N/A Worst Weak OK Good Great i have a function f:R^4-R^4, f(x,y,z,t)= (|x-y|,|y-z|,|z-t|,|t-x|). Apparently, for all (x,y,z,t) in R^4, there exist n such that (f^n)(x,y,z,t)=(0,0,0,0). How can this be proven?

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