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As has been noted repeatedly: “To Mock a Mockingbird” by Raymond Smullyan. It’s one of the finest mathematics/logic books ever written for the intelligent layman.

http://www.amazon.com/gp/product/0192801422?ie=UTF8&tag=...

(Yes, that’s an affiliate code. Strip it out and replace with your favourite charity. “Raganwald" is an acceptable answer for “favourite charity.”)

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Seems to be out of print on Amazon. Most sellers don't ship to foreign countries. Tough luck for people like me.

If you can't find it anywhere for cheaper (like me) buy it from here: http://www.bookdepository.com/Mock-Mockingbird-Raymond-Smull...

They ship to a very large amount of places for free. My only complaint is that because it is shipping from another country it takes a while to get to you and you don't get any tracking codes from them.

http://www.amazon.com/gp/offer-listing/0192801422/ref=tmm_pa...

Some of these places say they ship from the UK, some ship from the USA. One ships from Germany. Does this help?

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