Problem 13

Due in DSC 203 by 3 PM, Friday, November 30, 2001

Determine all functions f, which are everywhere differentiable and satisfy

$$f(x)+f(y)=f\left (\frac{x+y}{1-xy}\right )$$

for all real x and y with $xy\neq 1$.

Solutions, questions and/or comments should be directed to Judy Downey or Griff Elder

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Last modified:   Mon Nov 26 19:09:13 CST 2001