Maths Symbols

Source: tutorvista.com

Symbol	Symbol Name	Meaning/ definition	Example
x, y	x and y variable	unknown value to find	when 3x = 6, then x = 2
≡	equivalence	identical to	a ≡ b
≜	equal by definition	equal by definition	a ≜ b
~	approximately equal	weak approximation	11 ~ 10
≈	approximately equal	approximation	sin(0.01) ≈ 0.01
∝	proportional to	proportional to	f(x) ∝ g(x)
∞	lemniscates	infinity symbol	a ∞ b
≪	much less than	much less than	1 ≪ 1000000
≫	much greater than	much greater than	1000000 ≫ 1
( )	parentheses	calculate expression inside first	3 * (4+6) = 30
[ ]	brackets	calculate expression inside first	[(1+2)*(1+5)] = 18
{ }	braces	set	{1,2,3,4,5}
⌊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	3! = 1*2*3 = 6
f (x)	function of x	maps values of x to f(x)	f (x) = 3x+5
(a,b)	open interval	(a,b) ≜ {x | a < x < b}	x ∈ (2,6)
[a,b]	closed interval	[a,b] ≜ {x | a ≤ x ≤ b}	x ∈ [2,6]
∆	delta	change / difference	∆t = t1 - t0
∆	discriminant	Δ = b2 - 4ac	Δ = b2 - 4ac
∑	sigma	summation - sum of all values in range of series	∑ xi= x1+x2+...+xn
∑∑	sigma	double summation	∑∑ ab2
∏	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→∞

Below you can see more on algebra symbols and terms -

Symbol	Symbol Name	Meaning/ definition	Example
+	Plus	Addition of numbers	2 + 3 = 5
-	Minus	Subtraction of numbers	3 – 2 = 1
X	Product	Multiplication of numbers	5 x 4 = 20
/	Division	Divide the numbers	10/2 = 5
=	Equal	Equal to	2 = 2
≠	Not equal to	The given equation is not equal	X + 5 ≠ x + 3
±	Plus or minus	Both positive and negative numbers	Sqrt 16 = ± 4
α	alpha	Alpha value	α = 1.5
β	beta	Beta value	β= 0.5
Θ	theta	Used to represent degree of angle	q = 45 degree
σ	sigma	Sigma value	σ = 1.36
^	perpendicular	Perpendicular line