SchoolChalao

  • Helpline: +91-8058868746
  • Mail us: help@schoolchalao.com
  • LOGIN | REGISTER
    Tutorial Library

Learning Point

Algebra symbols

Previous Next

Symbol

Symbol Name

Meaning / definition

Example

x

x variable

unknown value to find

when 2x = 4, then x = 2

equivalence

identical to

 

equal by definition

equal by definition

 

:=

equal by definition

equal by definition

 

~

approximately equal

weak approximation

11 ~ 10

approximately equal

approximation

sin(0.01) ≈ 0.01

proportional to

proportional to

y x when y = kx, k constant

lemniscate

infinity symbol

 

much less than

much less than

1 1000000

much greater than

much greater than

1000000 1

( )

parentheses

calculate expression inside first

2 * (3+5) = 16

[ ]

brackets

calculate expression inside first

[(1+2)*(1+5)] = 18

{ }

braces

set

 

x

floor brackets

rounds number to lower integer

4.3 = 4

x

ceiling brackets

rounds number to upper integer

4.3 = 5

x!

exclamation mark

factorial

4! = 1*2*3*4 = 24

| x |

single vertical bar

absolute value

| -5 | = 5

f (x)

function of x

maps values of x to f(x)

f (x) = 3x+5

(f g)

function composition

(f g) (x) = f (g(x))

f (x)=3x,g(x)=x-1 (f g)(x)=3(x-1)

(a,b)

open interval

(a,b) = {x | a < x < b}

x (2,6)

[a,b]

closed interval

[a,b] = {x | axb}

x [2,6]

delta

change / difference

t = t1 - t0

discriminant

Δ = b2 - 4ac

 

sigma

summation - sum of all values in range of series

xi= x1+x2+...+xn

∑∑

sigma

double summation

http://www.rapidtables.com/math/symbols/statistical_symbols/double_sum_ex.gif

capital pi

product - product of all values in range of series

xi=x1∙x2∙...∙xn

e

e constant / Euler's number

e = 2.718281828...

e = lim (1+1/x)x , x→∞

γ

Euler-Mascheroni constant

γ = 0.527721566...

 

φ

golden ratio

golden ratio constant

 

π

pi constant

π = 3.141592654...

is the ratio between the circumference and diameter of a circle

c = πd = 2πr

 

 

Very Useful (0)

Useful (0)

Not Useful (0)