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How Evans' program works


Read these to get the ideas behind Evans' program. In particular, make sure that you can understand Winston's account, and that you could work an example for Finals by following it.

  1. Artificial Intelligence and Natural Man (either edition, Harvester Press) by Boden. There are several copies in the psychology library, and should be one in the RSL.

    The chapter on Creativity has a nice four-page account, conveying the essentials without confusing detail. That's pages 319-322 in both first and second editions. Treat it as preliminary reading to Winston.

  2. Artificial Intelligence by P.H.Winston (2nd ed, 1984, Addison-Wesley). Copies in the Psychology library and the RSL (Comp Bd 18).

    From the top of page 24 to half way down page 33 starts off with what distinguishes a good representation from a bad one, and then continues with Evans' program. Apart from section 5.3.3 of Evans' own article below, this gives almost all you need to reproduce the workings of Evans' program. One extra point: you should be aware that Winston's account is different from Evans' own, being simplified to make it easier to understand. The program was actually more complex (so it could run faster). However, the principle, of finding the difference between A and B, and then looking for that figure Dn which differs from C in the same way as B differs from A, is the same.

Jocelyn Paine
Tue Jun 3 11:33:37 BST 1997