nLab
hemisphere

Contents

Context

Spheres

Topology

topology (point-set topology, point-free topology)

see also differential topology, algebraic topology, functional analysis and topological homotopy theory

Introduction

Basic concepts

Universal constructions

Extra stuff, structure, properties

Examples

Basic statements

Theorems

Analysis Theorems

topological homotopy theory

Manifolds and cobordisms

Contents

Idea

Every n-sphere may be covered by two disks which each cover “half” of it (or a little more). These are the hemi-nn-spheres.

References

Last revised on December 1, 2019 at 14:10:54. See the history of this page for a list of all contributions to it.