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John, I completely agree with your decision to go for breadth. We need our best mathematical minds to learn as much as possible, not to finish as young as possible. http://cs.stmarys.ca/~dawson/funstuff.html A couple seem to be dead  I don't know what has happened to Vladimir Bulatov's page  and a few more may not be relevant. I do recommend the books on the book page. POVRay and Life seem to be perennial favorites among smart kids One author I haven't (yet) included is Dennis Shasha, whose "Dr Ecco" books are challenging and well written, in the same genre as Smullyan. Good Hunting!
Not sure how to adapt this  but here is something I did in the past with a high school student who had completed the current curriculum. The Russian (well almost any European) curriculum is years ahead of North American curriculum in geometry. It was challenging for both of us! I anticipate there would be comparable books for children his age. Walter Whiteley  


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