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by sb 5683 days ago
Because it was not mentioned until now, one of the following might probably come in handy:

- Basic Category Theory for Computer Scientists by Benjamin C. Pierce (from "Types and Programming Languages" fame)

- Practical Foundations of Mathematics, by Paul Taylor (has other interesting work on his homepage as well; http://www.paultaylor.eu/~pt/prafm/; somebody on HN pointed me to it, thanks!--Chapters 4,5,7)