… A convenient model for developing nonstandard analysis is the nonstandard model called the enlargement model. In this model, P ( x , y ) is a property of two real numbers x and y . For any finite number of real numbers x1 , x2 , …, xn , if there exists a real number y such that P ( xi , y )(1≦ i ≦ n ) holds, then by choosing an appropriate hyperreal number y , P ( x , y ) holds for all real numbers x (principle of co-occurrence). By choosing x < y as P ( x , y ), the existence of infinite hyperreal numbers is shown. … *Some of the terminology explanations that refer to the "principle of co-occurrence" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 超準解析を展開するのにつごうのよいモデルは広大モデルenlargementと称する超準モデルである。このモデルの中では,P(x,y)が二つの実数x,yに関する性質であり,任意の有限個の実数x1,x2,……,xnに対してP(xi,y)(1≦i≦n)が成り立つような実数yが存在するとき,適当な超実数yをとると,すべての実数xに対してP(x,y)が成り立つ(共起性の原理)。P(x,y)としてx<yをとることにより,無限大超実数の存在が示される。… ※「共起性の原理」について言及している用語解説の一部を掲載しています。 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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