## Abstract

The Separable Quotient Problem of Banach and Mazur asks if every infinite-dimensional Banach space has an infinite-dimensional separable quotient Banach space. It has remained unsolved for 85 years but has been answered in the affirmative for special cases such as reflexive Banach spaces. An affirmative answer to the Separable Quotient Problem would obviously imply that every infinite-dimensional Banach space has a quotient topological group which is separable, metrizable, and infinite-dimensional in the sense of topology. In this paper it is proved that every infinite-dimensional Banach space has as a quotient group the separable metrizable infinite-dimensional topological group, T^{ω}, where T denotes the compact unit circle group. Indeed it is shown that every locally convex space, which has a subspace which is an infinite-dimensional Fréchet space, has T^{ω} as a quotient group.

Original language | English |
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Pages (from-to) | 283-286 |

Number of pages | 4 |

Journal | Topology and its Applications |

Volume | 259 |

DOIs | |

State | Published - 1 Jun 2019 |

## Keywords

- Banach space
- Circle group
- Fréchet space
- Locally convex space
- Quotient group
- Quotient space
- Separable
- Separable Quotient Problem
- Topological group

## ASJC Scopus subject areas

- Geometry and Topology