# Quick notation question

by strokebow
Tags: notation
 Sci Advisor HW Helper PF Gold P: 12,016 For example: 1) $$A\in\mathcal{Z}$$ 2) $$A\notin\mathcal{Z}$$
 P: 228 $A$ 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: $A\notin\mathbb Z_+$.