How can I use mathematical symbols to indicate if a number is an integer or not?

[strokebow]

Hi,

I want to be able to say the following with mathematical symbols;

1) A is any integer.
2) A is a non-integer (not a whole number).

Please help.

Thanks

 

[arildno]

For example:
1) $$A\in\mathcal{Z}$$
2) $$A\notin\mathcal{Z}$$

 

[economicsnerd]

$A$ is an integer: $A\in\mathbb Z$.
$A$ is not an integer: $A\notin\mathbb Z$.
$A$ is a real number which is not an integer: $A\in\mathbb R\backslash\mathbb Z$.
$A$ is not a whole number: $A\notin\mathbb Z_+$.