常用数学符号英文对照Word文档下载推荐.docx

常用数学符号英文对照Word文档下载推荐.docx

《常用数学符号英文对照Word文档下载推荐.docx》由会员分享，可在线阅读，更多相关《常用数学符号英文对照Word文档下载推荐.docx（17页珍藏版）》请在冰豆网上搜索。

4islessthan5

≥

greaterthanorequalto

5≥4,

≥ 

isgreaterthanorequalto 

≤

lessthanorequalto

4≤5,

x≤y 

（）

parentheses

calculateexpressioninsidefirst

2×

（3+5）=16

[]

brackets

[（1+2）×

（1+5）]=18

+

plussign

addition

1+1=2

−

minussign

subtraction

2−1=1

±

plus-minus

bothplusandminusoperations

3±

5=8and-2

minus-plus

bothminusandplusoperations

5=-2and8

*

asterisk

multiplication

2*3=6

×

timessign

3=6

·

multiplicationdot

2·

÷

divisionsign/obelus

division

6÷

2=3

/

divisionslash

6/2=3

–

horizontalline

division/fraction

mod

modulo

remaindercalculation

7mod2=1

.

period

decimalpoint,decimalseparator

2.56=2+56/100

ab

power

exponent

23 

=8

a^b

caret

2^3 

√a

squareroot

√a 

=a

√9 

=±

3

3√a

cuberoot

3√a 

3√8 

=2

4√a

fourthroot

4√a 

4√16 

2

n√a

n-throot（radical）

for 

n=3, 

n√8 

%

percent

1%=1/100

10%×

30=3

‰

per-mille

1‰=1/1000=0.1%

10‰×

30=0.3

ppm

per-million

1ppm=1/1000000

10ppm×

30=0.0003

ppb

per-billion

1ppb=1/1000000000

10ppb×

30=3×

10-7

ppt

per-trillion

1ppt=10-12

10ppt×

10-10

Geometrysymbols

∠

angle

formedbytworays

∠ABC=30°

measuredangle

ABC=30°

sphericalangle

AOB=30°

∟

rightangle

=90°

α=90°

°

degree

1turn=360°

α=60°

deg

1turn=360deg

α=60deg

′

prime

arcminute,1°

=60′

59′

″

doubleprime

arcsecond,1′=60″

59′59″

line

infiniteline

AB

linesegment

linefrompointAtopointB

ray

linethatstartfrompointA

arc

arcfrompointAtopointB

=60°

⊥

perpendicular

perpendicularlines（90°

angle）

AC 

⊥ 

BC

||

parallel

parallellines

AB 

|| 

CD

≅

congruentto

equivalenceofgeometricshapesandsize

∆ABC≅∆XYZ

~

similarity

sameshapes,notsamesize

∆ABC~∆XYZ

Δ

triangle

triangleshape

ΔABC≅ΔBCD

|x-y|

distance

distancebetweenpointsxandy

| 

x-y 

|=5

π

piconstant

π 

=3.141592654...

istheratiobetweenthecircumferenceanddiameterofacircle

c 

= 

π·

d 

=2·

r

rad

radians

radiansangleunit

360°

=2πrad

c

=2π 

grad

gradians/gons

gradsangleunit

=400grad

g

=400 

Algebrasymbols

x

xvariable

unknownvaluetofind

when2x 

=4,then 

≡

equivalence

identicalto

≜

equalbydefinition

:

weakapproximation

11~10

sin（0.01）≈0.01

∝

proportionalto

∝ 

when 

kx,k 

constant

∞

lemniscate

infinitysymbol

≪

muchlessthan

1≪1000000

≫

muchgreaterthan

1000000≫1

2*（3+5）=16

[（1+2）*（1+5）]=18

{}

braces

set

⌊x⌋

floorbrackets

roundsnumbertolowerinteger

⌊4.3⌋=4

⌈x⌉

ceilingbrackets

roundsnumbertoupperinteger

⌈4.3⌉=5

x!

exclamationmark

factorial

4!

=1*2*3*4=24

|

singleverticalbar

absolutevalue

|-5|=5

f 

（x）

functionofx

mapsvaluesofxtof（x）

（x）=3x+5

（f 

∘ 

g）

functioncomposition

g）（x）= 

（g（x））

（x）=3x,g（x）=x-1⇒（f 

g）（x）=3（x-1）

（a,b）

openinterval

（a,b）={x 

a 

b}

x∈（2,6）

[a,b]

closedinterval

[a,b]={x 

≤ 

∈[2,6]

∆

delta

change/difference

∆t 

t1 

- 

t0

discriminant

Δ= 

b2 

-4ac

∑

sigma

summation-sumofallvaluesinrangeofseries

∑ 

xi=x1+x2+...+xn

∑∑

doublesummation

∏

capitalpi

product-productofallvaluesinrangeofseries

∏ 

xi=x1∙x2∙...∙xn

e

econstant 

/Euler'

snumber

e 

=2.718281828...

=lim（1+1/x）x 

x→∞

γ

Euler-Mascheroni 

constant

γ=0.527721566...

φ

goldenratio

goldenratioconstant

LinearAlgebraSymbols

Examp