- Rothe-Hagen identity
In
mathematics , the Rothe-Hagen identity is amathematical identity valid for all complex numbers (x, y, z) except where the denominators vanish::sum_{k=0}^nfrac{x}{x+kz}{x+kz choose k}frac{y}{y+(n-k)z}{y+(n-k)z choose n-k}=frac{x+y}{x+y+nz}{x+y+nz choose n}.
Wikimedia Foundation. 2010.