… a ( b ∪ c )= ab ∪ ac , ( b ∪ c ) a = ba ∪ caa ( b ∩ c )= ab ∩ ac , ( b ∩ c ) a = ba ∩ caThis condition is equivalent to a ≦ b ⇒ ac ≦ bc , ca ≦ cb when G is considered as an ordered set. In a lattice group G , if x >1 (identity element) and y is any element, then for any natural number n , if xn > y , then G is said to be an Archimedean lattice group. In the set Q of positive rational numbers, if we take two elements a and b , and reduce them to m / d and n / d , and define a ∪ b = (the greatest common divisor of m and n )/ d and a ∩ b = (the least common multiple of m and n )/ d , then a ∪ b and a ∩ b are determined regardless of the method of reducing them, and become Archimedean lattice groups. … *Some of the terminology explanations that mention "Archimedean bundle groups" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… a(b∪c)=ab∪ac,(b∪c)a=ba∪ca a(b∩c)=ab∩ac,(b∩c)a=ba∩caこの条件はGを順序集合と考えたとき, a≦b ⇒ ac≦bc,ca≦cbということと同値である。 束群Gにおいて,x>1(単位元)であり,yが任意の元ならば,適当な自然数nをとれば,xn>yとなるとき,Gはアルキメデス的束群であるという。 正の有理数全体Qにおいて,二元a,bをとったとき,それを通分して,m/d,n/dと表し,a∪b=(mとnの最大公約数)/d,a∩b=(mとnの最小公倍数)/dと定めると,a∪b,a∩bは通分のしかたにはかかわらず決まり,アルキメデス的束群になる。… ※「アルキメデス的束群」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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