
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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