数学公式的英语读法
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这些你都知道吗？以后给老外作报告的时候可千万别再
“The
equation is like this…”, “The value
is
like this…”
有些公式不好写，能看出来什么意思就行了。
∃
there exist
∀
for all
p
⇒
q p
im
plies q / if p, then q
p
⇔
q p if and only
if q /p is equivalent to q / p and q are
equivalent
x
∈
A x belongs to
A / x is an elem
ent (or a
m
em
ber) of A
x
∉
A x does not
belong to A / x is not an elem
ent (or a
m
em
ber) of A
A
⊂
B A is
contained in B / A is a subset of B
A
⊃
B A contains B
/ B is a subset of A
A
∩
B A cap B / A
m
eet B / A intersection B
A
∪
B A cup B / A
join B / A union B
AB A
m
inus B / the diference between A and B
A×
B A cross B /
the cartesian product of A and B
3. Real numbers
x+
1 x plus one
x-1 x m
inus one
x±
1 x plus or
m
inus one
xy xy
/ x m
ultiplied by y
(x-y)(x+
y) x
m
inus y, x plus y
=
the equals sign
x=
5 x equals 5 /
x is equal to 5
x≠
5 x (is) not equal to 5
x
≡
y x
is equivalent to (or identical with) y
x>
y 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
0
1 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
| m
od x /
m
odulus x
x
2
x squared / x
(raised) to the power 2
x
3
x cubed
x
4
x
to the fourth / x to the power 4
x
n
x to the nth /
x to the power n
x
(−n)
x to the (power) m
inus n
x
的平方根
(square)
root x / the square root of x
x
的三次根
cube root
(of) x
x
的四次根
fourth root
(of) x
x
的
n
次根
nth root (of) x
(x+
y)
2
x plus y all squared
n! n
factorial
x^x hat
x¯
x bar
x˜ x tilde
x
i
xi / x
subscript i / x suffix i / x sub i
∑(i=
1~n)
a
i
the sum
from
i equals one to n
a
i
/ the sum
as i
runs from
1 to n of the
a
i
4.
Linear algebra
‖
x
‖
the
norm
(or m
odulus) of x
OA
OA / vector OA
→
OA¯
OA / the length of the segm
ent OA
A
T
A
transpose / the transpose of A
A
−
1
A
inverse / the inverse of A
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