Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In mathematics, abstract nonsense, general abstract nonsense, and general nonsense are terms used facetiously by mathematicians to describe certain kinds of arguments and methods related to category theory. (Very) roughly speaking, category theory is the study of the general form of mathematical theories, without regard to their content. As a result, a proof that relies on category theoretic ideas often seems slightly out of context, sometimes to the extent that it resembles a comical non sequitur. Such proofs are dubbed “abstract nonsense”. More generally, “abstract nonsense” may refer to any proof (humorous or not) that uses primarily category theoretic methods, or even to the study of category theory itself. Note that referring to an argument as "abstract nonsense" is not a derogatory expression, and is actually often a compliment regarding the sophistication of the argument.

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