Characters and Cyclotomic Fields in Finite Geometry

by Bernhard Schmidt

Overview

This monograph contributes to the existence theory of difference sets, cyclic irreducible codes and similar objects. The new method of field descent for cyclotomic integers of presribed absolute value is developed. Applications include the first substantial progress towards the Circulant Hadamard Matrix Conjecture and Ryser‘s conjecture since decades. It is shown that there is no Barker sequence of length l with 13<1<4x10sub(12). Finally, a conjecturally complete classification of all irreducible cyclic two-weight codes is obtained.

Product Details

ISBN-13:	9783540442431
Publisher:	Springer Berlin Heidelberg
Publication date:	12/05/2002
Series:	Lecture Notes in Mathematics , #1797
Edition description:	2002
Pages:	108
Product dimensions:	6.10(w) x 9.25(h) x 0.01(d)

Table of Contents

1. Introduction: The nature of the problems.- The combinatorial structures in question.- Group rings, characters, Fourier analysis.- Number theoretic tools.- Algebraic-combinatorial tools. 2. The field descent: The fixing theorem.- Prescribed absolute value.- Bounding the absoute value.- The modulus equation and the class group. 3. Exponent bounds: Self-conjugacy exponent bounds.- Field descent exponent bounds. 4. Two-weight irreducible cyclic bounds: A necessary and sufficient condition.- All two-weight irreducible cyclic codes?- Partial proof of Conjecture 4.2.4.- Two-intersection sets and sub-difference sets