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Divisibility
Given integers
and 
, then we say 
divides 
if and only if there is some
such that 
.
There are many other ways in common use to express this relationship:
(read “
divides 
”).
is divisible
by 
.
is a factor of 
.
is a divisor of 
.
is a multiple of 
.
The notion of divisibility can apply to other rings (e.g., polynomials).