…Next, μ yR (*, y ) is defined as the minimum number of ys for which proposition R (*, y ) is true, and is undefined otherwise. A function f ( x 1 , …, x n ) is called a general recursive function when it is obtained by applying the above (1) to (5) and f ( x 1 , …, x n ) = μ y [ g ( x 1 , …, x n , y ) = 0] … (6) (where g is a function already given, and for all pairs of natural numbers x 1 , …, x n , there exists a y such that g ( x 1 , …, x n , y ) = 0) a finite number of times. This formulation and the development of recursion theory are greatly owed to the contributions of S.K. Kleene. … *Some of the terminology explanations that mention "general recursive function" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…次に,μyR(*,y)は,命題R(*,y)が成り立つようなyが存在するときそのようなyの最小数を値とし,そうでないときは値が定まらないものと規約する。関数f(x1,……,xn)が上の(1)~(5)および, f(x1,……,xn)=μy[g(x1,……,xn,y)=0] ……(6) (ここで,gはすでに与えられた関数で,すべ ての自然数の組x1,……,xnに対して,つねに g(x1,……,xn,y)=0を満たすようなyが存 在するものとする)を有限回適用して得られるとき,一般帰納的関数general recursive functionという。このような定式化および帰納的関数の理論recursion theoryの発展にはクリーネS.C.Kleeneの寄与に大きく負うている。… ※「general recursive function」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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