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Arthur A. Gleckler scripsit: > This doesn't seem to be useful enough to warrant inclusion in a general > library. Do you have some general class of applications in mind? It's the rational-number analogue of iota. It's not as intuitive an ordering as 1, 2, 3, 4, ... and can't be used for indexing, but it does traverse the whole (non-negative) set of rational numbers. The particulars of the ordering are nothing special, except that they require only a single item of state, the last rational number generated, and there is a once-and-only-once guarantee. -- John Cowan http://www.ccil.org/~cowan cowan@xxxxxxxx I suggest you solicit aid of my followers or learn the difficult art of mud-breathing. --Great-Souled Sam