﻿ ﻿﻿﻿ 以 u 开头的数学词汇 | 玄数
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## 以 u 开头的数学词汇

2012-10-08
undecagon   十一边形
A polygon having eleven sides.

unequal   不等于
Not the same in any measurable aspect, such as extent or quantity.

union 并
Also called join, logical sum, sum. The set consisting of elements each of which is in at least one of two or more given sets. Symbol: ∪.

unit fraction   单位分数
A rational number written as a fraction where the numerator is one and the denominator is a positive integer. A unit fraction is therefore the reciprocal of a positive integer, 1/n. Examples are 1/1, 1/2, 1/3, 1/4 ,1/5, etc.

unit of measurement   计量单位
Any division of quantity accepted as a standard of measurement or exchange; “the dollar is the United States unit of currency”.

unit price   单价
A price for foodstuffs, etc, stated or shown as the cost per unit, as per pound, per kilogram, per dozen, etc.

unit vector   单位向量
A vector having a length of one unit.

units   单位

• The lowest positive whole number; one.
• An element of a ring with a multiplicative inverse.

univariate   单变量
Having or using only one variable.

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