常用的数学符号和公式的读法.pptVIP

常用的数学符号和公式的读法 符号的英文读法 ≈ is approximately equal to 约等于号＜ is less than 小于号＞ is more than 大于号≮ is not less than 不小于号≯ is not more than 不大于号 ≤ is less than or equal to 小于或等于号 ≥ is more than or equal to 大于或等于号 ％ per cent 百分之… ‰ per mill 千分之… ∞ infinity 无限大号∝ varies as 与…成比例 ( ) parentheses 圆括号 √ (square) root 平方根 ∵ since; because 因为∴ hence 所以 符号的英文读法 ＋ plus 加号；正号－ minus 减号；负号× is multiplied by 乘号 ÷ is divided by 除号 ± plus or minus 正负号 ∫ the integral of …的积分( ∑ sigma) summation of 总和° degree 度＝ is equal to 等于号″ second 秒 ′ minute 分≠ is not equal to 不等于号℃ degrees Celsius /degrees Centigrade摄氏度 xy x is greater than y x≥y x is greater than or equal to y x y x is less than y x?y x is less than or equal to y 0x1 zero is less than x is less than 1 0?x?1 zero is less than or equal to x is less than or equal to 1 |x| mod x / modulus x x2 x squared / x (raised) to the power 2 x3 x cubed; the third power of x x4 x to the fourth / x to the power four xn x to the nth / x to the power n x-n x to the (power) minus n x over y n! n factorial (x+y)2 x plus y all squared the sum from i equals one to n ai x over y all squared f(x) fx / f of x / the function f of x f : S→T a function f from S to T x maps to y f?(x) f prime x f?(x) f double–prime x f??(x) f triple–prime x f??? (x) the fourth derivative of f with respect to x 函数(Functions) 常量:constant 变量：variable 极限：limit 无穷大：infinity 无穷小：infinitesimal 极大：maximum 极小：minimum 微分：differential 积分：integral 导数：derivative 特解：particular/special solution 通解：general solution 全解：complete solution 矩阵：matrix 行矩阵： row matrix 列矩阵：column matrix 单位阵：unit matrix 对角阵：diagonal matrix 逆矩阵：inverse matrix 转置矩阵：transposed matrix 向量： vector 标量： scalar 概率： probability 随机变量： random variable 均值：mean 方差：variance * * * * * * * * * *