Characters and Cyclotomic Fields in Finite Geometry

Bernhard Schmidt (Autor)

Buch | Softcover

VIII, 108 Seiten

2002 | 2002
Springer Berlin (Verlag)
978-3-540-44243-1 (ISBN)

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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<4x10^(12). Finally, a conjecturally complete classification of all irreducible cyclic two-weight codes is obtained.

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

Erscheint lt. Verlag	23.10.2002
Reihe/Serie	Lecture Notes in Mathematics
Zusatzinfo	VIII, 108 p.
Verlagsort	Berlin
Sprache	englisch
Maße	155 x 235 mm
Gewicht	182 g
Themenwelt	Mathematik / Informatik ► Mathematik ► Graphentheorie
Themenwelt	Mathematik / Informatik ► Mathematik ► Wahrscheinlichkeit / Kombinatorik
Schlagworte	Barker sequences • Circulant Hadamard matrices • combinatorics • Differences sets • Finite Geometrie • finite Geometry • irreducible cyclic codes
ISBN-10	3-540-44243-X / 354044243X
ISBN-13	978-3-540-44243-1 / 9783540442431
Zustand	Neuware