# Definition:Topological Property

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## Contents

## Definition

Let $P$ be a property whose domain is the set of all topological spaces.

Suppose that whenever $P \left({T}\right)$ holds, then so does $P \left({T'}\right)$, where $T$ and $T'$ are topological spaces which are homeomorphic.

Then $P$ is known as a **topological property**.

Loosely, a topological property is one which is preserved under homeomorphism.

## Also known as

- A
**topological property**is also known as a**topological invariant**.

## Also see

## Sources

- 1970: Lynn Arthur Steen and J. Arthur Seebach, Jr.:
*Counterexamples in Topology*... (previous) ... (next): $\text{I}: \ \S 1$: Functions - 1975: W.A. Sutherland:
*Introduction to Metric and Topological Spaces*... (previous) ... (next): $3.6$: Homeomorphisms - 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {A}.21$: Euler ($1707$ – $1783$)