Sökning: "Betti numbers"
Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Betti numbers.
1. Bounds on Hilbert Functions and Betti Numbers of Veronese Modules
Sammanfattning : The thesis is a collection of four papers dealing with Hilbert functions and Betti numbers.In the first paper, we study the h-vectors of reduced zero-dimensional schemes in . In particular we deal with the problem of findingthe possible h-vectors for the union of two sets of points of given h-vectors. LÄS MER
2. Ekedahl Invariants, Veronese Modules and Linear Recurrence Varieties
Sammanfattning : The title of this thesis refers to the three parts of which it is composed.The first part concerns the Ekedahl Invariants, new geometric invariants for finite groups introduced in 2009 by Torsten Ekedahl. LÄS MER
3. Chordal and Complete Structures in Combinatorics and Commutative Algebra
Sammanfattning : This thesis is divided into two parts. The first part is concerned with the commutative algebra of certain combinatorial structures arising from uniform hypergraphs. The main focus lies on two particular classes of hypergraphs called chordal hypergraphs and complete hypergraphs, respectively. LÄS MER
4. Graded Betti Numbers and Hilbert Functions of Graded Cohen-Macaulay Modules
Sammanfattning : In this thesis we study graded Cohen-Macaulay modules and their possible Hilbert functions and graded Betti numbers. In most cases the Cohen-Macaulay modules we study are level modules. LÄS MER
5. Around minimal Hilbert series problems for graded algebras
Sammanfattning : The Hilbert series of a graded algebra is an invariant that encodes the dimension of the algebra's graded compontents. It can be seen as a tool for measuring the size of a graded algebra. This gives rise to the idea of algebras with a "minimal Hilbert series", among the algebras within a certain family. LÄS MER