In general, if there is a set A of real numbers, and there is a number a that is smaller than any element belonging to A , then a is said to be the lower bound of set A , and we say that " A is lower-bounded." In terms of sequences, if there exists a real number a such that a ≦ x n for every term x n in the sequence x 1 , x 2 , ..., x n , ..., then a is the lower bound of this sequence, and the sequence is lower-bounded. Also, if there is a subset A of a poset and an element a , and a ≦ x for all x ∈ A , then a is said to be a lower bound of A , and A is said to be lower-bounded. When the lower bound a is specifically an element of A , a is called the smallest element. It can also be read as "kakai."UnderworldPlease see the "Lower Boundaries" page. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
一般にある実数の集合 A があって,A に属するどの元よりも小さい数 a があれば,a は集合 A の下界であるといい,「A は下に有界である」という。これを数列についていえば,数列 x1,x2,…,xn,… のどの項 xn をとっても a≦xn を満足する実数 a が存在すれば,a はこの数列の下界であって,数列は下に有界である。また,半順序集合の部分集合 A と元 a があって,すべての x∈A に対して a≦x であれば,a は A の下界であって,A は下に有界であるという。下界 a が特に A の元であるとき,a を最小元という。「かかい」とも読む。
下界
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