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gre数学考试常用符号详细解析:
+ |
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 |
∴ |
therore |
∵ |
because |
∶ |
ratio sign, divided by, is to |
∷ |
equals, as(proportion) |
|
square root of |
|
cube root of |
∥ |
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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