Definition:Separated

Definition
Let $$X$$ be a topological space.

Let $$A, B \subseteq X$$ such that: where $$\operatorname{cl} \left({A}\right)$$ denotes the closure of $$A$$ in $$X$$.
 * $$\operatorname{cl} \left({A}\right) \cap B = A \cap \operatorname{cl} \left({B}\right) = \varnothing$$

Then $$A$$ and $$B$$ are described as separated.