Terry croaked, "Don’t trust math too much, son," and he so confused him with references to the thermo-dynamical derivation of the mass action law, and to the oxidation reduction potential, that he stumbled again into raging humility, again saw himself an impostor and a tenth-rater.
There are no more uses of "derivation" in the book.
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The derivation is undeniable if you accept the rules of logic.
But I do not approve of this derivation, which seems to be a little strained.