Andy wrote: << After all, English mathematics routinely uses i as a variable in subscripts, and as the square root of -1, and that never seems to be a problem.

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I don't have any info about your other comments, but I can confirm that in English mathematics where the (or a) square root of -1 plays an important role, the subscript i (for an integer) is usually avoided. --Dan _____________________________________________________________________ "It don't mean a thing if it ain't got that certain je ne sais quoi." --Peter Schickele