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The older I get, the more I believe that at the bottom of most deep mathematical problems there is a combinatorial problem.
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Israel Moiseevich Gelfand
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If you understand something, you understand that it is obvious.
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Israel Moiseevich Gelfand
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Probably you are discouraged by this solution because it seems impossible to invent it. The authors share your feeling.
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Israel M. Gelfand (Algebra)
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People (or students) do not have shortcomings, only uniquenesses. The goal of a good teacher is to turn these uniquenesses into advantages.
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Israel Moiseevich Gelfand