# Contents

## Definition

The plane is the Cartesian space $\mathbb{R}^2$. This is naturally a topological space, a manifold, and a smooth manifold.

This is the stage of Euclidean geometry.

## References

For discussion of the plane via axioms for the points and lines in it (synthetic geometry) see the references at Euclidean geometry.

Last revised on March 17, 2017 at 01:49:41. See the history of this page for a list of all contributions to it.