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mxyxpt1k
searching PlanetScale…
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3 ms
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by
mxyxpt1k
7y ago
Did you mean Paul Lockhart? His book, "Measurement" is also good. He starts with some simple concepts, like length, and goes on to develop Geometry and then Calculus while encouraging the reader to consider various questions alo
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by
mxyxpt1k
8y ago
My 90 year old father-in-law has never used a computer or the Internet directly, but my wife buys from Amazon and searches Google for him.