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Today's date is Tuesday, October 20, 2020
School of Mathematics and Statistics
 January 2014
Friday 17
15:00 - SEMINAR - Groups and Combinatorics Seminar, Graphs and transitivity on 2-geodesics More Information
Alice Devillers (UWA)

will speak on

Graphs and transitivity on 2-geodesics

at 3pm Friday January the 17th in Blakers Lecture Theatre.

Abstract :

Joint work with Wei Jin, Cai Heng Li, Cheryl Praeger, Akos Seress.

An s-geodesic in a graph is a shortest path connecting two vertices at distance s. We say that a graph is locally transitive on s-geodsics if the stabiliser of any vertex is transitive on the s-geodesics starting at that vertex. Being locally transitive on s-geodesic is not a monotone property: if an automorphism group G of a graph is locally transitive on s-geodesics, it does not follow that G is locally transitive on shorter geodesics. For instance, (local) transitivity on 2-geodesics does not imply local transitivity on arcs (1-geodesics).

In this talk, I will first show a nice characterisation of all graphs that are locally transitive on 2-geodesics, but not locally transitive on 1-geodesics.

Then I will describe graphs that are (locally) transitive on 2-geodesics and on arcs, in terms of their local structure.
Friday 24
15:00 - SEMINAR - CMSC Technical Seminar, An introduction to IPE More Information
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. I will show the basic features of IPE, as well as some of the more advanced ones.
Friday 31
15:00 - SEMINAR - Groups and Combinatorics Seminar, Groups and first-order logic More Information
André Nies (University of Auckland)

will speak on

Groups and first-order logic

at 3pm Friday January the 31st in Blakers Lecture Theatre.

Abstract :

We study the expressive power of first-order logic for groups. A finitely generated group is called quasi-finitely axiomatizable if a single sentence characterizes it within the class of finitely generated groups. I showed in 2005 that, for instance, the Heisenberg group is quasi-finitely axiomatizable. Recent work of Lasserre provides new examples, such as the Thompson groups.

A group is homogeneous if the orbit of every tuple under the action of automorphisms is described by its first-order properties. I proved (J. Algebra, 2003) that the free group F_2 has this property. Recent work of Perrin and Sklinos (Duke Math. J. 2013) extends this to F_n for larger n.

 February 2014
Friday 07
15:00 - SEMINAR - Groups and Combinatorics Seminar, Row echelon matrices, flags and Grassmannians More Information
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. How much progress along this path is possible if fields are replaced by rings?
Monday 17
9:00 - COURSE - Introductory Statistics : A Short Course using SPSS Website | More Information
The aim of this course is to introduce you to basic statistics. It will cover descriptive statistics (means and standard deviations); data exploration; basic categorical data analysis; simple linear regression and basic analysis of variance (ANOVA). The statistical package SPSS will be used to illustrate the ideas demonstrated. The course will be held in a computer laboratory allowing participants to immediately apply the material covered through a series of practical examples.
Friday 21
15:00 - SEMINAR - Groups and Combinatorics Seminar, Metrically homogeneous graphs More Information
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, k-uniform hypergraph, digraph,...) with the property that every isomorphism between finite induced substructures of M extends to an automorphism of M. These are constructed by an amalgamation method developed by Fraisse (and independently Jonsson) in the 1950s. There are classification results, often very hard, in restricted contexts (e.g. graphs, partial orders, digraphs, totally ordered graphs) but in general classification seems out of reach.

I will discuss an attempt to classify `metrically homogeneous graphs', that is, countably infinite graphs M which become homogeneous when enriched by binary `distance relations' corresponding to graph-distance in M. This notion generalises distance transitivity for countably infinite graphs. Cherlin has produced a `catalogue' of metrically homogeneous graph and conjectures that it is complete. In joint work in progress with Amato and Cherlin, we verify the conjecture for metrically homogeneous graphs of diameter at most three.
Friday 28
15:00 - SEMINAR - Groups and Combinatorics Seminar, Subgroup covering numbers of symmetric groups More Information
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 such that G is equal to the set theoretic union of m proper subgroups of G. In 2005, Maroti determined the subgroup covering number for the symmetric group S_n, when n > 9 is odd, and he provided bounds for sufficiently large even values of n. I will discuss these previous results, joint work with Luise-Charlotte Kappe and Daniela Nikolova towards filling in the gap for small values of n, and ongoing work to determine the exact value for large even values of n.

17:00 - WELCOME - UCC Fresher Welcome : Get to know other new UCC members and the club, with free pizza! Website | More Information
New to the club this year? Want to meet some of the other new people, some older people, and do some computer stuff? At 5pm this Friday, all Freshers and new members should come on up to the loft (just above the clubroom; see your fresher guide) to break the ice on your UCC experience. There'll be a few short presentations and introductions on how to make the most of all the services the club supplies, including a basic introduction to Linux. As an added incentive, all first time members get FREE pizza!

 March 2014
Friday 07
15:00 - SEMINAR - Groups and Combinatorics Seminar, Factorizations of almost simple groups with a soluble factor More Information
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 will talk about the factorizations with one factor soluble, including construction of examples in classical groups and the classification result.
Monday 10
13:00 - Employer Recruitment Talk - Careers Centre: Teach for Australia Information Session : Hear from an alumnus about the TFA 2-year graduate program. Website | More Information
Come along and hear from Teach for Australia about their 2-year graduate program. This session will deliver information about the program, the application process, and an opportunity to ask an alumnus about what the experience was like.

"Our award-winning leadership program affords an accelerated two years of unprecedented personal growth and a Masters level of professional training. Come along to ask an alumnus why Australia's most outstanding young leaders are choosing our associate experience to rapidly advance their careers and make an impact on educational inequity".

All disciplines (particularly Science and Maths Graduates) outside of education are encouraged to attend and find out more.
Tuesday 11
13:00 - ANNUAL GENERAL MEETING - UCC AGM 2014 : The Annual General Meeting for UCC, 2014 Website | More Information
UCC's AGM, for the election of express purpose of electing the eight new committee members for 2014: president, vice president, treasurer, secretary, three ordinary commmittee members (OCMs), and one fresher representative (fresher rep).

Send all nominations and agenda items to [email protected] The current agenda can be found at https://wiki.ucc.asn.au/AGM2014Agenda.

If you don't know where the Council Meeting Room is, join the group leaving the clubroom just before 1pm, on Tuesday, 11th of March.

Hope to see lots of people there!
Friday 14
15:00 - SEMINAR - Groups and Combinatorics Seminar, The brilliant career of Frédéric Vanhove More Information
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? More Information
Pablo Spiga (Universita' di Milano-Bicocca)

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 finite Cayley graphs. The asymptotic number of Cayley graphs is much harder to pin down and we give a brief outline of the main technique and the main ingredients needed for this counting. On the way we leave some problems on oriented Cayley graphs and tournaments.
Monday 24
13:00 - COURSE - iVEC Supercomputing Training Website | More Information
In the week beginning 24 March 2014, iVEC will offer the following short courses on supercomputing topics:

Introduction to iVEC: 1:00 – 2:00pm Mon 24th March

Introduction to Linux: 3:00 – 4:00pm Mon 24th March

Introduction to Supercomputing: 10:00am – 4:00pm Tues 25th March

Developing with MPI and OpenMP: 10:00am – 4:00pm Wed 26th March

Debugging with DDT: 10am – 12:00 noon Thurs 27th March

Introduction to Optimisation and Profiling: 1:00 – 4:00pm Thurs 27 March

Courses are delivered in a face to face classroom style. Attendees are encouraged to bring and work on their own laptops. Staff from the Supercomputing Team will be facilitating so you can meet and chat with them.

Free parking available on-site.

Courses are free of charge and open to all, however places are limited.

Light refreshments and lunch will be provided on each day (no lunch on Monday).

Register online at https://www.ivec.org/ai1ec_event/ivec-supercomputing-training-february-2014-2/?instance_id=
Friday 28
15:00 - SEMINAR - Groups and Combinatorics Seminar, Primitive groups, diophantine equations, and functional equations More Information
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 play a crucial role in proving results about diophantine equations and functional equations. A sample application is that, for any polynomial f(X) with rational coefficients, the function Q-->Q defined by c --> f(c) is (<=6)-to-1 over all but finitely many values.

 April 2014
Friday 04
15:00 - SEMINAR - Groups and Combinatorics Seminar, Edge transitive dessins d'enfant More Information
Cai-Heng Li (UWA)

will speak on

Edge transitive dessins d'enfant

at 3pm Friday April the 4th in Weatherburn Lecture Theatre.

Abstract:

A 2-cell embedding of a bipartite graph in an orientable surface is called a dessin d'enfant. Thus a dessin d'enfant is an orientable bipartite map. I will present an explicit representation of an edge transitive dessin in terms of a group with two distinguished generators, and apply it to study the dessin.
Tuesday 08
11:00 - EXPO - Study Abroad & Exchange Fair : A festival of international study opportunities for UWA students More Information
There will be presentations by international visitors, games, prizes, a photo booth, treats on offer and lots and lots of information about exchange and study abroad opportunities for UWA students.

13:00 - ANNUAL GENERAL MEETING - Profectus UWA Annual AGM : An opportunity to find out more on UWA's first club on entrepreneurship Website | More Information
Come along to Profectus UWA's Inaugral 2014 AGM on Tuesday April 8. If you are passionate about business and entrepreneurship be sure to drop by at 1pm to learn more about our agenda. We will answer any questions you have about Profectus and events being held this semester!!!
Friday 11
15:00 - SEMINAR - Groups and Combinatorics Seminar, Graphs are to matroids what ribbon graphs are to ...? More Information
Steven Noble (Brunel University)

will speak on

Graphs are to matroids what ribbon graphs are to ...?

at 3pm Friday April the 11th in Weatherburn Lecture Theatre.

Abstract:

Much of the combinatorial structure of an abstract connected graph is encoded in its set of spanning trees. These form one of the canonical examples of the bases of a matroid. Ribbon graphs contain extra topological information on the embedding of the underlying abstract graph in a surface. The structures playing the role of spanning trees are the subgraphs having one boundary component. The combinatorial structure which they form is a delta-matroid, which roughly speaking is like a matroid except that the bases do not need to have the same size. We will discuss three classes of delta-matroids, some natural operations on ribbon graphs which correspond to natural operations on delta-matroids, give an excluded minor theorem for one of the classes of delta-matroids and, time-permitting describe the Bollobas-Riordan polynomial which forms one way of generalizing the Tutte polynomial to ribbon graphs.

 May 2014
Friday 02
15:00 - SEMINAR - Groups and Combinatorics Seminar, Some recent results on elusive groups More Information
Michael Giudici (UWA)

will speak on

Some recent results on elusive groups

at 3pm Friday May the 2nd in Weatherburn Lecture Theatre.

Abstract:

Every transitive permutation group has a derangement of prime power order but not necessarily a derangement of prime order. A transitive permutation group is called elusive if it has no derangements of prime order. I will talk about some recent results on this topic including elusive groups of automorphisms of graphs of small valency and a new construction of elusive groups.

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