Nice try, Andy, but logic failure. :p A musician isn't a number, so can't be reduced to an equation. A musician is a label i.e. a class or set item. Not an equation, but a Venn diagram (for which there is actually notation; but it's notation not an equation). Musician & non-musician are sets that do not overlap. Singer is a set within musician, as is instrumentalist. Singer & instrumentalist may or may not overlap, but both must lie (through their back teeth, if you've met some of the ones I have; they're as bad as fishermen!) wholly within musician. Therefore, regardless of bathroom or opera house, they can never overlap non-musician. So there! ;-)
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