
Displaying from Friday, October 11, 2013

October 2013

Friday 11 
15:00  SEMINAR  Groups and Combinatorics Seminar, Multiply tiling Euclidean space by translating a convex object

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Abstract:
We study the problem of covering Euclidean space R^d by possibly overlapping translates of a convex body P, such that almost every point is covered exactly k times, for a fixed integer k. Such a covering of Euclidean space by translations is called a ktiling. We will first (...)

Friday 18 
15:00  SEMINAR  Groups and Combinatorics Seminar, Regular orbits of Sym(n) and Alt(n) on irreducible representations

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Abstract:
Given a finite group G and a faithful irreducible FGmodule V where F is a field of prime order, we can ask whether G has a regular orbit on the vectors of V. This problem is related to determining which primitive permutation groups of affine type have a base of size 2, as well (...)

Friday 25 
15:00  SEMINAR  Groups and Combinatorics Seminar, Coprime actions of finite linear groups

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Abstract:
Let H be a finite linear group acting completely reducibly on a finite vector space V. Gabriel Navarro asked: if the Horbits containing vectors a and b have coprime lengths m and n, is there an Horbit of length mn?
We answered, by showing that the Horbit containing a + b (...)


November 2013

Friday 01 
15:00  SEMINAR  Groups and Combinatorics Seminar, Algebraic geometry codes

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Abstract:
Codes arising from algebraic geometry, first introduced by Goppa, gained attention when Tsfasman–Vladut–Zink used them to improve the GilbertVarshamow bound. We will give a gentle introduction to some of the beautiful ideas from algebraic geometry used to build these codes (...)

Friday 15 
15:00  SEMINAR  Groups and Combinatorics Seminar, A miscellany of topics related to semiregular graph automorphisms

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Abstract :
I will discuss a few things, all related to semiregular graph automorphisms : the polycirculant conjecture, the abelian normal quotient method, an interesting class of graphs...

Monday 18 
In 1950’s Fermi, motivated by fundamental questions of statistical mechanics, started a numerical experiment in collaboration with Pasta and Ulam to test the ergodic properties of nonlinear dynamical systems. The chosen socalled FPU system was a one dimensional chain of N nonlinear coupled (...)

Friday 22 
Selfavoiding walks (SAWs) are widely studied as a problem in algebraic combinatorics by mathematicians, as a problem in algorithm design by computer scientists, as a model of phase transitions by mathematical physicists and as a model of polymers in dilute solution by chemists.
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December 2013

Monday 09 
9:00  CONFERENCE  Australasian Conference on Combinatorial Mathematics and Combinatorial Computing : Held at UWA from the 9th to 13th of December

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This year's Australasian Conference on Combinatorial Mathematics and Combinatorial Computing will be held here at UWA from the 9th to 13th of December. Put the date in your diary now and start looking for cheap flights to Perth.
Visit the conference webpage to find the exciting lineup of invited (...)


January 2014

Friday 10 
15:00  SEMINAR  Groups and Combinatorics Seminar, Analysis and Implementation: the Two 'Editions' of a Matrix Group Algorithm

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Brian Corr (UWA)
will speak on
Analysis and Implementation: the Two 'Editions' of a Matrix Group Algorithm
at 3pm Friday January the 10th in Blakers Lecture Theatre.
Abstract :
The quality of an algorithm in computational mathematics is (...)

Friday 17 
15:00  SEMINAR  Groups and Combinatorics Seminar, Graphs and transitivity on 2geodesics

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Alice Devillers (UWA)
will speak on
Graphs and transitivity on 2geodesics
at 3pm Friday January the 17th in Blakers Lecture Theatre.
Abstract :
Joint work with Wei Jin, Cai Heng Li, Cheryl Praeger, Akos Seress.
An sgeodesic in (...)

Friday 24 
15:00  SEMINAR  CMSC Technical Seminar, An introduction to IPE

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Irene Pivotto (UWA)
will speak on
An introduction to IPE
at 3pm Friday January the 24th in Blakers Lecture Theatre.
Abstract:
IPE is a drawing editor for creating figures in PDF or EPS format, which can then be inserted into LaTeX documents (...)

Friday 31 
15:00  SEMINAR  Groups and Combinatorics Seminar, Groups and firstorder logic

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André Nies (University of Auckland)
will speak on
Groups and firstorder logic
at 3pm Friday January the 31st in Blakers Lecture Theatre.
Abstract :
We study the expressive power of firstorder logic for groups. A finitely generated group (...)


February 2014

Friday 07 
15:00  SEMINAR  Groups and Combinatorics Seminar, Row echelon matrices, flags and Grassmannians

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Phill Schultz (UWA)
will speak on
Row echelon matrices, flags and Grassmannians
at 3pm Friday February the 7th in Blakers Lecture Theatre.
Abstract:
There is a well trodden path from finite dimensional vector spaces to algebraic geometry (...)

Friday 21 
15:00  SEMINAR  Groups and Combinatorics Seminar, Metrically homogeneous graphs

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Dugald MacPherson (University of Leeds)
will speak on
Metrically homogeneous graphs
at 3pm Friday February the 21st in Blakers Lecture Theatre.
Abstract:
A `homogeneous structure' is a countably infinite relational structure M (e.g. graph (...)

Friday 28 
15:00  SEMINAR  Groups and Combinatorics Seminar, Subgroup covering numbers of symmetric groups

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Eric Swartz (UWA)
will speak on
Subgroup covering numbers of symmetric groups
at 3pm Friday February the 28th in Weatherburn Lecture Theatre.
Abstract:
Let G be a group. The subgroup covering number of G is defined to be the least integer m (...)


March 2014

Friday 07 
15:00  SEMINAR  Groups and Combinatorics Seminar, Factorizations of almost simple groups with a soluble factor

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Binzhou Xia (Peking University)
will speak on
Factorizations of almost simple groups with a soluble factor
at 3pm Friday March the 7th in Weatherburn Lecture Theatre.
Abstract:
Factorizations of almost simple groups arise in many contexts. I (...)

Friday 14 
15:00  SEMINAR  Groups and Combinatorics Seminar, The brilliant career of Frédéric Vanhove

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John Bamberg (UWA)
will speak on
The brilliant career of Frédéric Vanhove
at 3pm Friday March the 14th in Weatherburn Lecture Theatre.

Friday 21 
15:00  SEMINAR  Groups and Combinatorics Seminar, Have we ever tried to count Cayley graphs?

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Pablo Spiga (Universita' di MilanoBicocca)
will speak on
Have we ever tried to count Cayley graphs?
at 3pm Friday March the 21st in Weatherburn Lecture Theatre.
Abstract:
In this talk we give some elementary upper bounds on the number of (...)

Friday 28 
15:00  SEMINAR  Groups and Combinatorics Seminar, Primitive groups, diophantine equations, and functional equations

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Michael Zieve (University of Michigan)
will speak on
Primitive groups, diophantine equations, and functional equations
at 3pm Friday March the 28th in Weatherburn Lecture Theatre.
Abstract:
I will explain how results about primitive groups (...)


April 2014

Friday 04 
15:00  SEMINAR  Groups and Combinatorics Seminar, Edge transitive dessins d'enfant

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CaiHeng Li (UWA)
will speak on
Edge transitive dessins d'enfant
at 3pm Friday April the 4th in Weatherburn Lecture Theatre.
Abstract:
A 2cell embedding of a bipartite graph in an orientable surface is called a dessin d'enfant. Thus a dessin (...)


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