Why not stick to the poetic usage - "with ardours manifold"? Otherwise what difference does it make unless you wish to use it in an unambiguous sense for some operation, in which case you can define it in a useful fashion. Incidentally, in all my post grad studies of mathematics at Caltech and Cambridge I never heard of a function's having to be single valued. For example, asinx has an infinite number of values for any real argument, x, and a set more if x be complex.
Peter Lissaman, Da Vinci Ventures Expertise is not knowing everything, but knowing what to look for. 1454 Miracerros Loop South, Santa Fe, New Mexico 87505,USA tel:(505)983-7728
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