# Definition:Indiscrete Topology

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## Definition

Let $S \ne \varnothing$ be a set.

Let $\tau = \left\{{S, \varnothing}\right\}$.

Then $\tau$ is called the **indiscrete topology** on $S$.

A topological space $\left({S, \left\{{S, \varnothing}\right\}}\right)$ is known as an **indiscrete space**.

## Also known as

- The
**trivial topology**(on $S$) - The
**nondiscrete topology**(on $S$)

## Also see

- Results about
**indiscrete topologies**can be found here.

## Linguistic Note

Be careful how you spell **indiscrete**. A common homophone horror is to refer to this as the **indiscreet topology**.

However, **indiscreet** means **incautious** or **tactless**. It's how you describe somebody who cannot keep a secret.

## Sources

- 1962: Bert Mendelson:
*Introduction to Topology*... (previous) ... (next): $\S 3.2$: Topological Spaces: Example $3$ - 1964: Steven A. Gaal:
*Point Set Topology*... (previous) ... (next): $\S 1.1$ - 1970: Lynn Arthur Steen and J. Arthur Seebach, Jr.:
*Counterexamples in Topology*... (previous) ... (next): $\text{II}: \ 4$ - 1975: W.A. Sutherland:
*Introduction to Metric and Topological Spaces*... (previous) ... (next): $3.1$: Topological Spaces: Example $3.1.6$