Update Harper's book link

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Mariano 2015-08-21 00:24:59 -03:00
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@ -425,7 +425,7 @@ If you want to follow up on type and category theory:
- [Awodey](http://ukcatalogue.oup.com/product/9780199237180.do) and
[MacLane](http://www.amazon.com/Categories-Working-Mathematician-Graduate-Mathematics/dp/0387984038). The standard textbooks on category theory.
- [Harper's Practical Foundations for Programming Languages](http://www.cs.cmu.edu/~rwh/plbook/book.pdf) is the best PL focused intro to type theory I've read.
- [Harper's Practical Foundations for Programming Languages](http://www.cs.cmu.edu/~rwh/plbook/1sted-revised.pdf) is the best PL focused intro to type theory I've read.
- [Type theory and Functional Programming](http://www.cs.kent.ac.uk/people/staff/sjt/TTFP/).