# Category:Open Sets

This category contains results about Open Sets in the context of Topology.

Let $T = \left({S, \tau}\right)$ be a topological space.

Then the elements of $\tau$ are called the open sets of $T$.

Thus:

$U \in \tau$

and:

$U$ is open in $T$

are equivalent statements.

## Subcategories

This category has the following 5 subcategories, out of 5 total.