以 a 开头的数学词汇 | 玄数

2012-10-05
abacus   算盘
A frame with small balls which slide along wires. It is used as a tool or toy for counting.
abacus

abscissa  横坐标
In plane Cartesian coordinates, the x-coordinate of a point: its position from the origin (y axis) measured parallel to the x-axis.
abscissa

absolute value  绝对值
The absolute value of a real or complex number is the distance from that number to the origin. For any real number x the absolute value or modulus of x is denoted by |x|.
absolute value

acre  英亩
Exactly equal to 1⁄640 of a square mile, about 4,046 m2.

acute angle  锐角
The angle is smaller than a right angle (less than 90°)
acute angle

acute triangle  锐角三角形
A triangle with all interior angles measuring less than 90°
acute triangle

add  加
Put numbers or amounts together to get a total. The signal is “+”.

addend  加数
An addend number which is involved in addition. Numbersbeing added are considered to be the addends.

addition  加法;增加
The process of adding two or more numbers together to find their total. 1+1=2, 5+8=13.

additive identity  加法恒等元,加法单位元
When added to any element x in the set, yields x. Usually the sum of the number x and 0 yields the same number.

additive inverse  加性逆元
The opposite of a number. For example, the additive inverse of 12 is -12.

adjacent  邻近的

adjacent angles  邻角
Two angles are adjacent when they have a common side and a common vertex (corner point), and don’t overlap.
adjacent angles

adjoint matrix 伴随矩阵
The adjoint of a square matrix A, is the transpose of the matrix of cofactors of A.
adjoint