Abstract-nonsense meaning

(mathematics, humorous) Details which are straightforward but so tedious that an author or lecturer would rather skip them (especially those of a category theoretical nature).
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(mathematics, humorous) Details which involve diagram chasing.
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(mathematics, humorous) Category theory in general.
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Origin of abstract-nonsense

  • Coined by Norman Steenrod, popularized by Serge Lang.

    From Wiktionary