Image (mathematics)
In
mathematics, an
image is a value or set of values of a
function. Specifically, let
f be a function from the
set X to the set
Y. If
a is an element of
X, then its image under
f is the value
f(
a). If
A is a
subset of
X, then its image under
f is
f(
A) = {
f(
a) :
a∈
A}. Finally, the image of
f itself is
f(
X), i.e. the same as the
range of
f.