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It's not a paper, just an anecdote - in one of the many stories about him he mentions that he liked to independently solve problems that other people had already solved in order to learn the subject in question better, and to advance his problem solving skills. Sorry for lack of source, I'm quite tired... if you can't find it let me know and I'll try to dig it up tomorrow.

Oh, in that sense! I thought you implied he had solved some math problem that happened to be useful in voxel engines or something.

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