Past Events



Past Combinatorics Seminars


Spring 2021


Autumn Term 2020


Spring Term 2020


Autumn Term 2019


Summer Term 2019


Spring Term 2019
Autumn Term 2018
Summer Term 2018
Spring Term 2018
Autumn Term 2017
Summer Term 2017


Spring Term 2017


Autumn Term 2016


Summer Term 2016
Monday 25th April 2016, 1pm François Pirot (ENS Lyon) The bounds for the distance-t chromatic number, and the effect of removing cycles.
Monday 9th May 2016, 11am Bruce Reed (McGill University) On the Structure of Typical H-Free Graphs.
Monday 16th May 2016, 1pm Fiona Skerman (University of Bristol/Heilbronn Institute) Modularity of random graphs.
Monday 20th June 2016, 1pm Jon Noel (University of Oxford) Extremal Bounds for Bootstrap Percolation in the Hypercube.
Tuesday 5th July 2016, 2pm at LTB Victor Falgas-Ravry (Vanderbilt University) Multicolour containers and the entropy of decorated graph limits.
Monday 18th July 2016, 1pm Marthe Bonamy (Université de Bordeaux) Kempe equivalence of colourings.
Wednesday 3rd August 2016, 1.30pm at LTC Adam Wagner (University of Illinois),
Wei En Tan (University of Birmingham),
Matthew Jenssen (London School of Economics) and
Ewan Davies (London School of Economics).
Birmingham Student Combinatorics Day

Spring Term 2016

Monday 11th January 2016, 1pm Jie Han (University of Birmingham) Perfect matchings in k-uniform hypergraphs and the Erdos Matching Conjecture.
Monday 18th January 2016, 1pm Robert Hancock (University of Birmingham) On solution-free sets of integers
Monday 25th January 2016, 1pm Barnaby Roberts (London School of Economics) The Ramsey numbers of powers of paths and cyles
Monday 1st February 2016, 1pm Annika Heckel (University of Oxford) The chromatic number of dense random graphs
Monday 8th February 2016, 1pm He Sun (University of Bristol) Faster construction of linear-sized spectral sparsification
Monday 22nd February 2016, 1pm Amelia Taylor (University of Birmingham) Clique decompositions of multipartite graphs and completion of Latin squares
Monday 29th February 2016, 1pm Bhargav Narayanan (University of Cambridge) The multiplication table problem for bipartite graphs
Monday 7th March 2016, 1pm Tássio Naia Dos Santos (University of Birmingham) Universal trees in tournaments
Monday 14th March 2016, 1pm Thomas Perrett (Technical University of Denmark) Colouring graphs with sparse neighbourhoods: bounds and applications
Monday 21st March 2016, 1pm Oliver Schaudt (University of Koln) H-free obstructions against 3-colorability

Autumn Term 2015

Monday 5th October 2015, 1pm Guillem Perarnau (University of Birmingham) Connectivity in bridge-addable graph classes: the McDiarmid-Steger-Welsh conjecture.
Monday 12th October 2015, 1pm Andrew McDowell (University of Birmingham) Factors in random graphs.
Monday 26th October 2015, 1pm Andreas Galanis (University of Oxford) Phase transitions in the complexity of counting
Monday 2nd November 2015, 1pm Shoham Letzter (University of Cambridge) Monochromatic cycle partitions - an exact result
Monday 9th November 2015, 1pm Agelos Georgakopoulos (University of Warwick) Group walk random graphs
Monday 16th November 2015, 1pm Liana Yepremyan (McGill University) The local stability method and the Turan numbers of extensions
Monday 23rd November 2015, 1pm Quentin Berthet (University of Cambridge) Counting to learn: combinatorial tools in statistical learning
Monday 30th November 2015, 1pm Matthew Jenssen (London School of Economics) The k-color Ramsey number of odd cycles via non-linear optimization
Wednesday 9thth December 2015, 3:30pm
David Ellis (Queen Mary) Stability results for some geometric inequalities, via entropy.

Summer Term 2015

Monday 11th May 2015, 2pm Ryan Martin (Iowa State University) Recent progress on diamond-free families.
Thursday 21st May 2015, 2pm Frederik Garbe (University of Birmingham) The complexity of the hypergraph Hamilton cycle problem.
Thursday 28th June 2015, 2pm Stefan Glock (University of Birmingham) Optimal path and cycle decompositions of dense quasirandom graphs.
Thursday 25th June 2015, 2pm Jan Volec (ETH Zurich) Properly colored and rainbow copies of graphs with few cherries.
Tuesday 14th July 2015, 2pm Louis DeBiasio (Miami University) Covers of (pseudo)random graphs by monochromatic subgraphs.
Thursday 16th July 2015, 2pm Hong Liu (University of Illinois at Urbana-Champaign) The typical structure of maximal triangle-free graphs.

Spring Term 2015

Thursday 15th January 2015, 2pm Bill Jackson (Queen Mary, University of London) Generic rigidity of point-line frameworks.
Thursday 22nd January 2015, 2pm Will Perkins (University of Birmingham) Hard spheres, independent sets, and birthday inequalities.
Thursday 29th January 2015, 2pm Mirco Musolesi (University of Birmingham) Temporal dynamics of social and technological networks.
Thursday 5th February 2015, 2pm Simon Griffiths (University of Oxford) The Ramsey number of the clique and the hypercube.
Wednesday 11th February 2015, 12 noon Candy Bowtell (University of Birmingham) Intersecting set systems.
Thursday 12th February 2015, 2pm Natasha Morrison (University of Oxford) Saturation in the Hypercube.
Thursday 19th February 2015, 2pm Lutz Warnke (University of Cambridge) Phase transitions in Achlioptas processes.
Friday 27th February 2015, 4pm Peter Allen (London School of Economics) Sparse Blow-up Lemmas.
Thursday 5th March 2015, 2pm Julia Böttcher (London School of Economics) Local resilience of spanning subgraphs in sparse random graphs.
Thursday 12th March 2015, 2pm Karen Gunderson (University of Bristol) Graph bootstrap percolation.
Thursday 19th March 2015, 2pm Oleg Pikhurko (University of Warwick) Measurable circle squaring.
Thursday 26th March 2015, 2pm Ben Barber (University of Birmingham) Edge-decompositions of graphs with high minimum degree.

Autumn Term 2014

2nd October 2014, 2pm Felix Joos (Universität Ulm) Induced matchings
9th October 2014, 2pm Amelia Taylor (University of Birmingham) Arbitrary orientations of Hamilton cycles in digraphs
16th October 2014, 1:30pm Jaehoon Kim (University of Birmingham) Improper colouring and other graph parameters
23th October 2014, 2pm Richard Montgomery (University of Cambridge) Spanning Trees in Random Graphs
29th October 2014, 4pm Robert MacKay (University of Warwick) Mathematics Colloquium : A kinematic explanation for gamma-ray bursts
6th November 2014, 2pm Andrzej Grzesik (Jagiellonian University) Around the Caccetta-Haggkvist Conjecture
13th November 2014, 1:30pm Ping Hu (University of Warwick) Rainbow triangles in three-colored graphs
20th November 2014, 2pm Katherine Staden (University of Birmingham) On degree sequences forcing the square of a Hamilton cycle
27th November 2014, 1:30pm Tim Townsend (University of Birmingham) On the structure of oriented graphs and digraphs with forbidden tournaments or cycles
3rd December 2014, 4pm Tom Leinster (University of Edinburgh) Mathematics Colloquium: The many faces of magnitude
4thDecember 2014, 2pm Hamed Amini (Swiss Finance Institute) Shortest-weight Paths in Random Graphs
11th December 2014, 1:30pm Wei En Tan (University of Birmingham) Probabilistic Intuition in Waiter-Client and Client-Waiter games
Spring Term 2014

23rd January 2014, 2pm Wojciech Samotij (Tel Aviv/Cambridge) Counting H-free graphs
30th January 2014, 2pm Michal Przykucki (University of Cambridge) Phase transitions in bootstrap percolation
6th February 2014, 2pm Anita Liebenau (University of Warwick) What is Ramsey-equivalent to the clique?
12th February 2014, 4pm Leslie Goldberg (University of Oxford) Pure Maths Colloquium
13th February 2014, 2pm Ben Barber (University of Birmingham) Partition regularity in the rationals
20th February 2014, 2pm Ararat Harutyunyan (University of Oxford) On the chromatic number of digraphs
27th February 2014, 2pm Jozsef Balogh (University of Illinois at Urbana-Champaign) Subdivisions of a large clique in $C_6$-free graphs
6th March 2014, from 1.30pm Joint Birmingham-Warwick seminar: Alex Scott (University of Oxford)
Short talks: Jan Foniok (Warwick) Tim Townsend (Birmingham)
Full schedule
13th March 2014, 2pm Mykhaylo Tyomkyn (University of Birmingham) Universality of graphs with few triangles and anti-triangles
19th March 2014, 4pm Reidun Twarock (University of York) Pure Maths Colloquium
Wed 26th March 2014, 5pm Inaugural lecture: Deryk Osthus (University of Birmingham) Randomness to the rescue: If in doubt, flip a coin
1st May 2014 Diana Piguet (University of Birmingham) Extensions of Mantel's theorem

Autumn Term 2013

16th September 2013, 2pm Oliver Cooley (Graz University of Technology) Giant components in random hypergraphs
2nd October 2013, 4pm Marina Iliopoulou (University of Birmingham) Joint Analysis-Combinatorics seminar
3rd October 2013, 2pm Shagnik Das (UCLA) The minimum number of disjoint pairs in set systems
10th October 2013, 2pm Michel Bode (University of Birmingham) On the component structure of random geometric graphs on the hyperbolic plane
17th October 2013, 2pm Yi Zhao (Georgia State University) Minimum degree thresholds for Hamilton cycles in k-uniform hypergraphs
24th October 2013, 2pm Mohammed Amin Abdullah (University of Birmingham) Viral Processes by Random Walks on Random Regular Graphs
30th October 2013, 4pm Mike Gunn (University of Birmingham) Pure Maths Colloquium: Rotating ultra cold gases - fluid dynamics in the space of analytic functions
7th November 2013, 2pm Marthe Bonamy (Université Montpellier 2 - LIRMM) The Erdos-Hajnal Conjecture
14th November 2013, 2pm Ross Kang (Utrecht University) Set hitting times in Markov chains
20th November 2013 LMS/ERC Analysis one-day workshop This event will include a number of talks involving connections between Analysis and Combinatorics
21st November 2013, 2pm Elad Aigner-Horev (Universität Hamburg) On pseudorandomness in combinatorics
27th November 2013, 4pm Iain Gordon (Edinburgh) Pure Maths Colloquium
5th December 2013, 2pm Kitty Meeks (Queen Mary University of London) The parameterised complexity of subgraph counting problems
12th December 2013, 2pm Elisabetta Candellero (University of Warwick) Clustering phenomenon in random geometric graphs on the hyperbolic plane

Spring Term 2013

10th January 2013, 2pm Nikolaos Fountoulakis (University of Birmingham) Random hyperbolic graphs: degree distribution and clustering
17th January 2013, 2pm Kerstin Weller (University of Oxford) Asymptotic properties of minor-closed classes of graphs
24th January 2013, 2pm Allan Lo (University of Birmingham) Proof of the 1-factorization and Hamilton decomposition conjectures
31st January 2013, 2pm Perla Sousi (Cambridge University) Hunter, Cauchy Rabbit, and Optimal Kakeya Sets (joint with the analysis seminar)
7th February 2013, 2pm Malgorzata Bednarska-Bzdega (Adam Mickiewicz University) Avoider - Forcer games (Maths Colloquium on the same week)
14th February 2013, 2pm Andrzej Grzesik (Jagiellonian University) Flag algebra calculus
21st February 2013, 2pm Alon Naor (Tel Aviv University) Positional games on random boards
28st February 2013, 2pm Milos Stojakovic (University of Novi Sad) Many collinear k-tuples with no k+1 collinear points
7th March 2013, 2pm Mirjana Mikalacki (University of Novi Sad) Doubly biased Maker-Breaker Connectivity game (Maths Colloquium on the same week)
14th March 2013, 2pm John Lapinskas (University of Birmingham) Optimal packings of Hamilton cycles in graphs of high minimum degree
21nd March 2013, 2pm Viresh Patel (University of Birmingham) A conjecture of Thomassen on Hamilton cycles in highly connected tournaments
7th May 2013, 2pm Tim Townsend (University of Birmingham) Fractional and integer matchings in uniform hypergraphs
6th June 2013, 10am Tobias Muller (Utrecht University) Logic and random graphs
24th June 2013, 4pm Ryan Martin (Iowa State University) Multipartite Version of the Alon-Yuster Theorem

Autumn Term 2012

27th September 2012, 2pm Allan Lo (University of Birmingham) Properly coloured Hamilton cycles in edge-coloured complete graphs
4th October 2012, 2pm Katherine Staden (University of Birmingham) Approximate Hamilton decompositions of regular expanders
10th October 2012, 4pm Alexandre Stauffer (Universita Roma Tre) Space-time percolation and detection by mobile nodes
18th October 2012, 2pm Eoin Long (Queen Mary, University of London) Perturbing Sperner's theorem
24th October 2012, 4pm Pure Mathematics Colloquium: Prof. S. Velani (University of York) Diophantine approximation: the Lebesque and Hausdorff theories
1st November 2012, 2pm Elisabetta Candellero (University of Birmingham) Random walks on free products of groups
8th November 2012, 2pm Matthew Yancey (University of Illinois at Urbana-Champaign) Ore's conjecture on color-critical graphs is almost true
15th November 2012, 2pm Asaf Ferber (Tel-Aviv University) Counting and packing hamilton cycles in graphs and digraphs
16th November 2012, 10am Anusch Taraz (TU München) Colouring embeddable hypergraphs
22nd November 2012, 2pm Denis Clemens (FU Berlin) Fast strategies in Maker- Breaker games played on random boards
29th November 2012, 5.15pm Daniela Kühn (University of Birmingham) Graph Theory - simple questions which lead to difficult problems
6th December 2011, 2pm Andrew Thomason (University of Cambridge) Independent sets and list colourings of hypergraphs

Spring Term 2012

12th January 2012, 2pm Diana Piguet (University of Birmingham) Embedding cycles of given length in oriented graphs
19th January 2012, 2pm Andrew Treglown (Charles University, Prague) Minimum degree thresholds for perfect matchings in hypergraphs
26th January 2012, 2pm (Watson 304) Tom Sanders (University of Oxford) Freiman's theorem: the structure theory of set addition
2nd February 2012, 2pm Fiachra Knox (University of Birmingham) Embedding Spanning Bipartite Graphs of Small Bandwidth
8th February 2012, 4pm Pure Mathematics Colloquium
16th February 2012, 2pm Oleg Pikhurko (University of Warwick and CMU) On Possible Turan Densities
23rd February 2012, 2pm (Watson 304) Richard Mycroft (University of Birmingham) A Multipartite Hajnal-Szemeredi Theorem
1st March 2012, 2pm Jan Hladky (University of Warwick) f-vectors of three-dimensional flag Gorenstein* complexes via extremal graph theory
7th March 2012, 4pm Pure Mathematics Colloquium
15th March 2012, 2pm Andras Mathe (University of Warwick) Regularity lemma and limits of posets
15th May 2012, 12:30 (LRC) Maya Stein (Universidad de Chile) Strong Ramsey saturation for cycles

Autumn Term 2011

29th September 2011, 4pm Philipp Sprüssel (University of Oxford) The fundamental group of an infinite graph with ends (CANCELLED!)
6th October 2011, 4pm Allan Lo (University of Birmingham) F-factors in hypergraphs via absorption
13th October 2011, 4pm David Ellis (Queen Mary, University of London) Triangle-intersecting families of graphs
20th October 2011, 4pm Pure Mathematics Colloquium by John Conway (Princeton)
27th October 2011, 4pm Bjarne Toft (University of Southern Denmark) The board game Hex ? history, results, problems
3rd November 2011, 4pm Danny Hefetz (University of Birmingham) Hitting time results for Maker-Breaker games
10th November 2011, 4pm Bela Csaba (University of Birmingham) An Ore-type packing problem
17th November 2011, 4pm Lutz Warnke (University of Oxford) Explosive percolation is continuous
23rd November 2011, 4pm Pure Mathematics Colloquium by Simon Blackburn (Royal Holloway, University of London) What is the probability that a pair of elements in a group are conjugate?
1st December 2011, 4pm Colin Cooper (King's College, University of London) Component structure of the vacant set induced by a random walk on a random graph
8th December 2011, 4pm Wojciech Samotij (Trinity College, University of Cambridge) Independent sets in hypergraphs

Spring Term 2011

19th January 2011 Terence Tao (UCLA) Pure Mathematics Colloquium
26th January 2010 Pablo Candela (Cambridge) Analysis/Combinatorics Joint Seminar: Fourier Analysis and Linear Equations
17th February 2011, 2pm Matthias Mnich (Berkeley) Feedback vertex sets in tournaments
23rd February 2011, 4pm Graham Brightwell (LSE) Pure Mathematics Colloquium

Autumn Term 2010

4th October 2010 Ryan Martin (Iowa State University) Recent results on the edit distance of graphs
11th October 2010 Diana Piguet (Birmingham) An approximate version of the Loebl-Komlos-Sos conjecture in sparse graphs
25th October 2010 Andrew Treglown (Birmingham) Bipartite graph tilings
3rd November 2010 Roger Heath-Brown (Oxford) Pure Mathematics Colloquium
8th November 2010 Mark Walters (Queen Mary, London) Connectivity in k-nearest neighbour graphs
22nd November 2010 Demetres Christofides (Warwick) Hamilton cycles in dense vertex-transitive graphs
1st December 2010 Ben Green (Cambridge) Pure Mathematics Colloquium
6th December 2010 Richard Mycroft (Queen Mary, London) Perfect matchings in graphs, k-graphs and k-systems

Previous seminars: Autumn 2006, Spring 2007, Autumn 2007, Spring 2008, Autumn 2008, Spring 2009, Autumn 2009, Spring 2010.

Last updated on 03.11.2016