The text on this website is copyright in the same way as any other publication. It is of course legitimate to make small quotations from it. A link to this site should then be put in to acknowledge the origin of quoted text. For any more substantial use of the material on this site you should ask permission from me. You should also ask my permission to use any of the graphic icons or the images which are marked as being (...) my photographs. (shrink)

The origin of my article lies in the appearance of Copeland and Proudfoot's feature article in Scientific American, April 1999. This preposterous paper, as described on another page, suggested that Turing was the prophet of 'hypercomputation'. In their references, the authors listed Copeland's entry on 'The Church-Turing thesis' in the Stanford Encyclopedia. In the summer of 1999, I circulated an open letter criticising the Scientific American article. I included criticism of this Encyclopedia entry. This was forwarded to Prof. Ed Zalta, (...) editor of the Encyclopedia, and after some discussion he invited me to submit an entry on ' Alan Turing.'. (shrink)

Almost everything Turing wrote is now accessible on-line in some form, much of it in the Turing Digital Archive, which makes available scanned versions of the physical papers held in the archive at King's College, Cambridge University. See..

The day was particularly appropriate. There was a great deal of publicity for the 50th anniversary of the world's first working modern computer, which ran at Manchester on 21 June 1948. And at 10.30pm the night before, 22 June 1998, the House of Commons had voted by a large majority to change the law so that homosexual and heterosexual acts would alike be governed by an 'age of consent' of 16. It was recognised by all sides that the issue at (...) stake was that of equality. (Note added later: the law was indeed finally changed on 30 November 2000, despite intense opposition from christian leaders in the unelected House of Lords.). (shrink)