"Hans F. Zschintzsch" wrote: > So there is at least one metric a little bit more interesting > than just |f,g|=0 if f=g and |f,g|=1 otherwise. Alas, it only appears to be more interesting. On a discrete space all metrics are equivalent. (More technically, the various metric spaces are all diffeomorphic.) -- ray -- je suis marxiste, tendance groucho