A polygon having eleven sides.
Not the same in any measurable aspect, such as extent or quantity.
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.
- The lowest positive whole number; one.
- An element of a ring with a multiplicative inverse.
Having or using only one variable.