MATHEMATICAL SYMBOLS
Algebra symbols
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
|
∞
|
|||
≪
|
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
|
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