For those who need some context: In 1983 David Warren published a paper describing an abstract machine that could be used as the target of a Prolog compiler. This machine became the basis of most Prolog compilers - it is much faster than interpreters. His paper was not easy to understand. Hasan Air-Kaci's book was a brilliant exposition of Warren's work, and was a must-read for anyone serious about working on Prolog interpreters or compilers.
Note that this is Professor David HD Warren. As opposed to Professor David S Warren, who led the XSB Prolog team. Which is built around the Warren Abstract Machine.
Oh dear, that reminds me of one of my courses I had to take where we had to memorise the WAM and execute it on paper in the exam. Most useless course ever.
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