# Quick notation question

1. ### strokebow

101
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).

Thanks

2. ### arildno

12,015
For example:
1) $$A\in\mathcal{Z}$$
2) $$A\notin\mathcal{Z}$$

1 person likes this.
3. ### economicsnerd

258
$A$ 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: $A\notin\mathbb Z_+$.