Hamming distance, I think. On Aug 26, 2010 6:47 PM, "Marc LeBrun" <mlb@well.com> wrote: A very rough kind of ³lexical distance² between strings (possibly infinite) is just the number of symbols by which they differ. Is there an Official Name for this? _______________________________________________ math-fun mailing list math-fun@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/math-fun