Definition:Gaussian Integer

Definition
A Gaussian integer is a complex number whose real and imaginary parts are both integers.

That is, a Gaussian integer is a number in the form:
 * $$a + b i: a, b \in \Z$$

The set of all Gaussian integers can be denoted $$\Z \left[{i}\right]$$, and hence can be defined as:
 * $$\Z \left[{i}\right] = \left\{{a + b i: a, b \in \Z}\right\}$$

Some sources use the symbol $$J$$ for the set $$\Z \left[{i}\right]$$.