In the margins of Bachet's edition of the works of Diophantus , P. de Fermat discovered a surprising proof of the following proposition: "When n is a natural number greater than or equal to 3, the indeterminate equation xn + yn = zn has no integer solutions such that xyz ≠ 0, " but wrote (around 1637) that the margins were too narrow to include the proof. This proposition is known as Fermat's Last Theorem. The solutions to this indeterminate equation when n = 2 are called Pythagorean triples, and it has been known since Greek times that an infinite number of them exist, which contrasts starkly with this proposition. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
P.deフェルマーはバシェBachet版のディオファントス著作集の余白に,次の命題〈nが3以上の自然数のときには,不定方程式〉 xn+yn=zn〈はxyz≠0であるような整数解をもたない〉の驚くべき証明を発見したが,その証明を記すにはこの余白は狭いという意味のことを書いた(1637年ころ)。この命題は,フェルマーの大定理,あるいは最終定理と呼ばれる。この不定方程式のn=2の場合の解はピタゴラス数と呼ばれ,ギリシア時代から無限に存在することが知られており,この命題とは著しい対比をなしている。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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