Added math to the book, including a very small number of problems for the reader to solve. I expect the reaction at that point is going to be, "WTF is this math doing here?" but I promise it's useful.
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(I'm trying to stick entirely to the easy and practical math and not going off into crazy impenetrable stuff that the reader probably can't tune to match the thermodynamics of the equipment they're using even if they did have a reason to expect it to be useful)
