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Are generalizations bad? In general, is it a mistake to say something about everything? Given two sets in an unknown universe, what can we do with them? Taking the compliment is out, but some binary operations are ok. The intersection makes a set no closer to the scary universe, so that's fine. The difference also is ok. But the union makes something that may or may not be the universe. If we have a shorthand for everything, then how do we know when increasingly complex unions lose information? Losing information is bad because it wastefully heats up the thing that loses the information. In general, life evolves by reducing waste. Workers reduce waste by unionizing. Is this a pun or generalization?