My book on “sets for mathematics” does not include notation “F(X)”. Are “F” and “X” both functors? Or are X and Y objects in a category?

As an alternative to explaining your notation, you could also consider putting in a link to a paper or book that explains your notation.

I mean if I use a symbol like [tex]\sigma_x[/tex] I say that it means a Pauli spin matrix, I don’t leave my readers guessing.

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