## Abstract

We associate to a full flag F in an n-dimensional variety X over a field k, a “symbol map” μ_{F}: K(F_{X})→∑^{n}K(k). Here, F_{X} is the field of rational functions on X, and K (∙) is the K-theory spectrum. We prove a “reciprocity law” for these symbols: Given a partial flag, the sum of all symbols of full flags refining it is 0. Examining this result on the level of K-groups, we derive the following known reciprocity laws: The degree of a principal divisor is zero, the Weil reciprocity law, the residue theorem, the Contou-Carrère reciprocity law (when X is a smooth complete curve), as well as the Parshin reciprocity law and the higher residue reciprocity law (when X is higher-dimensional).

Original language | American English |
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Pages (from-to) | 27-46 |

Number of pages | 20 |

Journal | Annals of K-Theory |

Volume | 2 |

Issue number | 1 |

DOIs | |

State | Published - 2017 |

Externally published | Yes |

### Bibliographical note

Publisher Copyright:© 2017 Mathematical Sciences Publishers.

## Keywords

- Contou-Carrère symbol
- K-theory
- Parshin reciprocity
- Parshin symbol
- Reciprocity laws
- Symbols in arithmetic
- Tate vector spaces