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The playful (or abstract) side of the numbers 1, 2, 3, which requires some basic training in advanced math, as compared to the serious (or boring) side taught in elementary school.
Donald is writing an enrichment math book entitled "As Difficult As 1–2–3" for gifted kids to expose them to the abstract beauty of the numbers 1, 2, and 3, especially when viewed from a mathematician's advanced standpoint.
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by MathPlus March 01, 2017
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