Ptt 大爆卦 | Integer ring - 前往 https://mathoverflow.net/questions/333028/definability-of-the-ring-of-integer-in-algebraic-extensions-of-mathbb-q

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Definability of the ring of integer in algebraic extensions of Q

J. Robinson has proved that exists a formula ψ(x) in the language of rings which,applied to the rational numbers, defines the the ring integers (making the ...

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