Neil wrote: << there are millions of places where "phi" is used and where "tau" is used for (1+sqrt(5))/2 ! it is too late to try to unify the notation, sorry!

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I don't think it's ever too late to *try* to unify notation. But, the current state where two symbols are used for the same thing is not especially bad. On the other hand, to try to redefine one of these to mean its reciprocal (as a previous poster suggested) would be only making any current ambiguity worse. --Dan _____________________________________________________________________ "It don't mean a thing if it ain't got that certain je ne sais quoi." --Peter Schickele