Algebra Symbols

Algebra Symbols and mathematical naming convention

a,b,c,d, e,f	constants, variables; coefficient of a polynomial
i, j, k	index variables for sequences; e.g is a term of sequence $${}_{}$$
l, w	length and width of a figure, a geometrical shape
f, g, h	Functions
n, m, p, q	integers
n	counting of objects, "let's have n objects"
p, q	prime numbers
r	remainder, rest or "modulus"
r,s,t	variables
u,v	variables
w,x,y,z	unknown quantities in equations, variables
x,y,z	variables, unknown quantities; cartesian axes
z	variable for complex numbers
α, β, γ, θ, φ	angles
ε	very small quantity (calculus; limits)
λ	Eigenvalue (linear algebra)
σ	Sum or standard deviation (statistics)
	a times b, multiplication of a by b
	a times b, multiplication of a by b
	a divided by b, or a:b
	exponential
	distributive law

Source:
http://en.wikipedia.org/wiki/Variable_%28mathematics%29#Name_conventions
The Princeton Companion to Mathematics

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