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Looking at the table of contents, this seems like a really odd title. In what sense is this practical and a foundation for mathematics?

> In what sense is this practical and a foundation for mathematics?

in a strong computational sense

Ah, now it makes sense, thanks! I was misinterpreting "of" as "for".

It's "practical" for the academic. Everyone else should just get a discrete math book and work through the first few chapters.