
Displaying from Thursday, June 27, 2013

July 2013

Friday 05 
15:00  SEMINAR  Groups and Combinatorics Seminar, On PseudoInjective Group Algebra

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Abstract:
A module M is called pseudoinjective if for every submodule X of M, any monomorphism f : X > M can be extended to a homomorphism g : M > M. Let K be a field and G a group. It is well known that a group algebra K[G] is selfinjective if and only if the group (...)


August 2013

Friday 02 
15:00  SEMINAR  Groups and Combinatorics Seminar, Maximal arcs that contain regular hyperovals

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Abstract:
A maximal narc is a set of q(n1) + n points in a projective plane such that any line of the plane meets 0 or n of them. The most common maximal arcs, called the Mathon arcs, are constructed by taking the union of regular hyperovals. In particular, there are no known maximal 4 (...)

Friday 09 
15:00  SEMINAR  Groups and Combinatorics Seminar, Semisymmetric graphs of prime valency

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Abstract:
A graph is called Xsemisymmetric if the group X acts transitively on edges, but not on vertices. Such graphs are necessarily bipartite and biregular, of valencies k and l say. There is a natural relationship between semisymmetric graphs and amalgams of groups. This leads us (...)

Sunday 11 
10:00  OPEN DAY  2013 Open Day : Join us for our Centenary Open Day and experience all that UWA has to offer

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Come and find out about our undergraduate and postgraduate courses, career options, scholarship opportunities, our valuable research, community programs and facilities.
There's also residential college tours, handson activities, live music, entertainment, and plenty of fun activities (...)

Friday 16 
15:00  SEMINAR  Groups and Combinatorics Seminar, Decomposing tensor products over fields of small characteristic

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Abstract:
One motivation for this talk comes from representation theory: decomposing a tensor product of irreducible (or indecomposable) representations as a sum of smaller degree irreducible (or indecomposable) representations. Other motivations come from quantum mechanics and (...)

Friday 23 
15:00  SEMINAR  Groups and Combinatorics Seminar, Breaking symmetries of infinite graphs

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Abstract:
Symmetry breaking involves colouring the elements of a combinatorial structure so that the resulting structure has no nontrivial symmetries. In this talk I'll give an introduction to symmetry breaking, with a particular focus on infinite graphs. I'll also discuss a number of (...)

Friday 30 
15:00  SEMINAR  Groups and Combinatorics Seminar, The structure of 3separations of matroids

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Abstract:
In this talk, I will give an introduction to decomposition theory of 3connected matroids. In order to make it more accessible I will also introduce some related definitions and examples.


September 2013

Friday 06 
15:00  SEMINAR  Groups and Combinatorics Seminar, Connections between Graph Theory & Combinatorics on Words

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Abstract:
A string or word is usually thought of as a sequence of letters drawn from some alphabet. Applications to bioinformatics and other areas suggest the utility of defining strings on subsets of the alphabet instead  socalled "indeterminate" strings. I describe (...)

Friday 13 
15:00  SEMINAR  Groups and Combinatorics Seminar, On The Noncommuting Graph

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Abstract:
In this talk, we will consider the noncommuting graph of a nonabelian finite group G; its vertex set is the set of noncentral elements of G, and two distinct vertices x and y are joined by an edge if they do not commute together. Actually, we study some properties of the (...)

Friday 20 
15:00  SEMINAR  Groups and Combinatorics Seminar, Generalised quadrangles constructed from groups

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Abstract:
This is just a survey talk of various ways to construct all of the known finite generalised quadrangles starting with a group and a configuration of subgroups of that group. In particular, the speaker will give a summary of where one of the "retreat" problems is at.

Wednesday 25 
11:00  SEMINAR  Mathematics Colloquium: The CohenLenstra heuristics: from arithmetic to topology and back again

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Akshay Venkatesh (Stanford) Mahler Lecturer and IAS ProfessoratLarge
will speak on
The CohenLenstra heuristics: from arithmetic to topology and back again.
at 11am in the Science Library Access Grid room.
I will discuss some models of (...)

Friday 27 
15:00  SEMINAR  Groups and Combinatorics Seminar, Straightline programs with memory and applications to computational group theory

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Abstract:
Straightline programs offer a method for encoding group computations in a "black box" sense, namely without using specifics of the group's representation or how the group operations are performed. We advocate that straightline programs designed for group (...)


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 Tsfasmanâ€“Vladutâ€“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 (...)

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 1950â€™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.
More (...)


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 (...)


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