150 search results for “algebra” in the Public website

Graphing algebraic formulas
Many students have difficulties to read and give meaning to algebraic formulas. In this study it is explored whether graphing formulas with pen and paper will improve students’ability to reason with algebraic formulas.

Becoming friends with algebraic formulas
Peter Kop, secondary school teacher, PhD, and teacher educator at ICLON, studied how sketching a graph of an algebraic formula could promote students’ symbol sense. Defence on 18 November.

Positive representations of algebras of continuous functions
If X is a locally compact Hausdorff space, then a representation of the complex C* algebra C_0(X) on a Hilbert space $H$ is given by a spectral measure that takes its values in the orthogonal projections on $H$.

Algebra, Geometry and Number Theory
The research of the Algebra, Geometry and Number Theory programme ranges from fundamental mathematical theory to algorithms and applications.

Class invariants for tame Galois algebras
Promotores: B. Erez, P. Stevenhagen, CoPromotor: B. de Smit

Crossed product algebras associated with topological dynamical systems
Promotor: S.M. Verduyn Lunel, Copromotoren: M.F.E. de Jeu, S.D. Silvestrov

On the Galois closure of commutative algebras
Promotores: H.W. Lenstra, B. Erez, Copromotor: L. Taelman

Algebra, Geometry and Number Theory (MSc)
The master’s specialisation Algebra, Geometry and Number Theory at Leiden University is aimed at students who wish to acquire a profound knowledge of one of the areas within pure mathematics. There is a strong theme dealing with algebra and number theory as well as a strong theme dealing with topology…

Algebra, Geometry and Number Theory
The research of the Algebra, Geometry and Number Theory cluster tries to bridge the gap between abstract theory and the world of algorithms and applications.

Principal algebraic actions of the discrete Heisenberg group
Promotor: Prof.dr. W.T.F. den Hollander, Prof. dr. E.A. Verbitskiy

Algebraic techniques for low communication secure protocols
Promotor: R. Cramer

Jaap Murre
Wiskunde en Natuurwetenschappen

Enumerative arithmetic
This thesis consists of three chapters. Each chapter is on a different subject. However, all three chapters address issues that arise in counting arithmetically interesting objects.

Marco Streng
Wiskunde en Natuurwetenschappen

Peter Bruin
Wiskunde en Natuurwetenschappen

David Holmes
Wiskunde en Natuurwetenschappen

Ronald van Luijk
Wiskunde en Natuurwetenschappen

isomorphisms, order antimorphisms and their interplay with Jordan algebra structures
In dit onderzoek worden orde isomorfismen en orde antimorfisme bestudeerd in het algemene kader van partieel geordende vector ruimten.

Mima Stanojkovski
Wiskunde en Natuurwetenschappen

Hendrik Lenstra
Wiskunde en Natuurwetenschappen

Bas Edixhoven
Wiskunde en Natuurwetenschappen

Realtime tomographic reconstruction
With tomography it is possible to reconstruct the interior of an object without destroying.

Ronald Cramer
Wiskunde en Natuurwetenschappen

Martin Lubke
Wiskunde en Natuurwetenschappen

Martin Bright
Wiskunde en Natuurwetenschappen

M. Bhargava
Wiskunde en Natuurwetenschappen

Rosa Winter
Wiskunde en Natuurwetenschappen

Sjabbo Schaveling
Wiskunde en Natuurwetenschappen

JanHendrik Evertse
Wiskunde en Natuurwetenschappen

Robin de Jong
Wiskunde en Natuurwetenschappen

Bart de Smit
Wiskunde en Natuurwetenschappen

Stefan van der Lugt
Wiskunde en Natuurwetenschappen

Joost Batenburg
Wiskunde en Natuurwetenschappen

Peter Stevenhagen
Wiskunde en Natuurwetenschappen

Bart de Smit appointed as professor Algebra and Number Theory
On Tuesday 15 September 2015, Bart de Smit has been appointed as professor of Algebra and Number Theory at the Mathematical Institute of Leiden University.

Group representations in Banach spaces and Banach lattices
Promotor: S.M. Verduyn Lunel, Copromotores: M.F.E. de Jeu, B. de Pagter

On some classes of modules and their endomorphism rings
Promotores: Prof.dr. H Lenstra, Prof.dr. A Facchini (Padova University)

NWO tenure track grant in arithmetic algebraic geometry
Within the context of the four national mathematics clusters, NWO has awarded seven proposals for tenure track positions. One of these was on 'Moduli, metrics, models, and arithmetic of Shimura varieties' by Bas Edixhoven from the Leiden Mathematical Institute.

Julian Lyczak
Wiskunde en Natuurwetenschappen

Positive representations of algebras of continuous functions
PhD Defence

New weblecture available of statician Bradley Efron
Bradley Efron is a statistician from Stanford University best known for proposing the bootstrap resampling technique, which has had a major impact in the field of statistics and virtually every area of statistical application. The bootstrap was one of the first computerintensive statistical techniques,…

Error bounds for discrete tomography
Promotores: K.J. Batenburg, B. Koren

Links between cohomology and arithmetic
Promotor: S.J. Edixhoven

'Maths is often way ahead of practical applications'
A secret code that we currently use to send emails securely is based on the maths of a century ago. The geometrical surfaces that Dino Festi studied during his PhD research will perhaps be used in future codes or new physics. PhD defence 5 July.

Counting problems for number rings
Promotor: H.W. Lenstra

Ronald Cramer inaugurated as KNAW Member
On 30 September 2013 Ronald Cramer, head of the Cryptology group of Centrum Wiskunde & Informatica (CWI) and a professor of cryptology at the Mathematical Institute of Leiden University, was inaugurated as a member of the Royal Netherlands Academy of Arts and Sciences (KNAW).

Travelling patterns on Discrete Media
This thesis describes how complex and realworld relevant analytical solutions can be found starting from a simple Nagumo problem posed on one or twodimensional lattices.

Arithmetic of affine del Pezzo surfaces
In this thesis integral points on affine del Pezzo surfaces are studied.

The unit residue group
The unit residue group, to which the present thesis is devoted, is defined using the normresidue symbol, which Hilbert introduced into algebraic number theory in 1897.

Algebraic filters for filtered backprojection
PhD Defence