More revised chapters on category theory

The old chapters on products (pre-categorial reflections followed by the categorial story) have been considerably tidied up, with the more tedious intricacies rather better corralled into a separate optional chapter, and other chapters giving the main conceptual news re-organized.

So there are now twelve chapters (pp. 102) available of Category Theory I: Notes towards a gentle introduction.

This takes us to roughly the half-way point in the planned coverage of Category Theory I. As always, the usual invitation applies — comments on this work in progress most gratefully received!

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