GRE数学部分用到的主要符号
2017/2/21 17:29:01来源：新航道作者：新航道
摘要：GRE数学部分用到的主要符号 ＋ plus ;positive － minus ;negative multiplied by ;times divided by ＝ equals。
＋ 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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