### Abstract

We introduce the notion of metric cotype, a property of metric spaces related to a property of normed spaces, called Rademacher cotype. Apart from settling a long standing open problem in metric geometry, this property is used to prove the following dichotomy: A family of metric spaces F is either almost universal (i.e., contains any finite metric space with any distortion > 1), or there exists α > 0, and arbitrarily large n-point metrics whose distortion when embedded in any member of F is at least Ω ((log n) ^{α}). The same property is also used to prove strong non-embeddability theorems of L _{q} into L _{p}, when q > max{2, p}. Finally we use metric cotype to obtain a new type of isoperimetric inequality on the discrete torus.

Original language | English (US) |
---|---|

Pages | 79-88 |

Number of pages | 10 |

DOIs | |

State | Published - Feb 28 2006 |

Externally published | Yes |

Event | Seventeenth Annual ACM-SIAM Symposium on Discrete Algorithms - Miami, FL, United States Duration: Jan 22 2006 → Jan 24 2006 |

### Other

Other | Seventeenth Annual ACM-SIAM Symposium on Discrete Algorithms |
---|---|

Country | United States |

City | Miami, FL |

Period | 1/22/06 → 1/24/06 |

### All Science Journal Classification (ASJC) codes

- Software
- Mathematics(all)

## Fingerprint Dive into the research topics of 'Metric cotype'. Together they form a unique fingerprint.

## Cite this

*Metric cotype*. 79-88. Paper presented at Seventeenth Annual ACM-SIAM Symposium on Discrete Algorithms, Miami, FL, United States. https://doi.org/10.1145/1109557.1109567