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GMAT数学考试:主要数学符号的英文表达

2008-11-20 
一些主要数学符号的英文表达方法介绍。
+plus ;positive
-minus ;negative
× multiplied by ;times
÷ divided by
= equals
≈ approximately equals
≠ not equal to
< less than
> greater than
≤ equal to or less than  
≥ equal to or greater than o
(   ) round brackets ;parentheses
[   ] square brackets
{   } braces
∈ is a member of the set
⊂ is a subset of
∽ similar to
≌ congruent to
* denotes an operation
∴ therefore
∵ because
∶ ratio sign, divided by, is to
∷ equals, as(proportion)
 ∥parallel to
⊥ perpendicular to, at right angles with
∠ angle
∟ right angle
º degree
′ minute
″ second
⊙ circle
A⁀B arc AB
e the base of natural logarithms,approx.2.71828
x! factorial x, x(x-1)(x-2)---1
lognx log x to the base n
π pi
lnx log x to the base e(natural logarithm)
lgx log x to the base 10(common logarithm)
|x| the absolute value of x
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