This is a superbly written, fascinating, greatly informative book.
I have used it primarily as an introduction to lambda calculus and
intuitionistic logic in its BHK, natural deduction, and sequent calculus
forms, not to mention the comparative treatment of those with their
classical counterparts. In these regards, it is clear and concise while
nonetheless being thorough and presenting a full spectrum of interesting results,
i.e., all the highpoints and more. It also explains the history and motivation
and offers hundreds of useful references. It also has chapters on
second-order logic and polymorphism. I say all this having read
perhaps 1/15th of the material; I'm very happy I bought it.
And of course, it has a lot to say about their main topic, the Curry-Howard
isomorphism, which I am now finding I need to understand as well.
Good thing I have this book. These authors have just done a magnificent job.
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