Associate Professor in Mathematics. Main research interests: extremal combinatorics and discrete probability.

Associate professor at
Department of Mathematics and Mathematical Statistics

MIT-huset, plan 3, Matematik och matematisk statistik, B341
Umeå universitet,
901 87
Umeå

**Short bio**

- 2004-2008, MMath, University of Cambridge, UK
- 2008-2012, PhD University of London, UK
- 2012-2014, Kempe research fellow, Umeå Universitet
- 2014-2016, Assistant professor, Vanderbilt University, USA
- 2016- , Associate professor, Umeå University
- 2019-, Docent, Umeå University

**Research areas**

I work in extremal combinatorics and discrete probability, especially extremal graph and hypergraph theory and random graphs.

Extremal combinatorics is concerned with a certain kind of optimisation problems. In essence, it the mathematics of making the best choice possible in a discrete context and showing no better choice exists. More helpfully perhaps, a typical problem in extremal combinatorics is to maximise or minimise a parameter inside a finite structure subject to some restrictions. For instance: what is the smallest number of weighings on a pair of scales needed to identify a counterfeit coin? how do you win high-dimensional versions of tic-tac-toe? what is the most robust graph you can build with a given number of edges?

While such problems may look like mere puzzles at first glance, they have a great variety of applications within mathematics, statistics and computer science, in particular when it comes to designing optimal structures or algorithms with respect to some parameter or constraint. Progress in extremal combinatorics often occurs at a methodological level: to solve one particular problem, one must develop a new technique which then turns out to be applicable in many other situations. Extremal combinatorics is a very active and exciting area of research, which has seen some major developments in recent years, and in which there are a great many open problems yet to be solved.

My work in discrete probability for its part focusses on random graph models. Motivation for studying such models stems from a desire to gain a rigorous understanding of the behaviour of real-world networks such as social networks, communication networks or neural networks. While these networks may be governed by deterministic principles, they are too large and too complex to be analysed directly. A solution is to model them mathematically as random graphs, encoding statistical information about the real-world network as a probability distribution for a random graph. The typical behaviour of the random graph then provides a good approximation for the actual behaviour of the network. This paradigm underpins the field of statistical physics, which has widespread applications in economics, computer science, biology, physics and chemistry.

**Other information**

- From 2020, I am responsible for the Master's programmes in Mathematics and Mathematical Statistics.
- Since Fall 2016, I run the Discrete Mathematics Seminar.
- For the period, 2017-2020 my research is supported by a Swedish Research Council Starting Grant (VR 2016-03488).
- Follow this link to see my profile on Google Scholar

2019

Random structures & algorithms (Print), Wiley-Blackwell 2019, Vol. 54, (4) : 676-720

Falgas-Ravry, Victor; O'Connell, Kelly; Uzzell, Andrew

2018

International mathematics research notices, Oxford University Press 2018, (5) : 1411-1441

Behrstock, Jason; Falgas-Ravry, Victor; Hagen, Mark; et al.

2018

The Electronic Journal of Combinatorics, Vol. 25, (2)

Falgas-Ravry, Victor; Lo, Allan

2018

Journal of Graph Theory, Vol. 88, (3) : 411-427

Falgas-Ravry, Victor; Markström, Klas; Verstraëte, Jacques

2017

The European Conference on Combinatorics, Graph Theory and Applications (EUROCOMB'17), Elsevier 2017 : 407-413

Falgas-Ravry, Victor; Pikhurko, Oleg; Vaughan, Emil; et al.

2016

The Electronic Journal of Combinatorics, Vol. 23, (3)

Falgas-Ravry, Victor; Markström, Klas

2016

SIAM Journal on Discrete Mathematics, Vol. 30, (4) : 1899-1917

Falgas–Ravry, Victor; Zhao, Yi

2015

Electronic Communications in Probability, Vol. 20, (50) : 1-6

Björklund, Johan; Falgas-Ravry, Victor; Holmgren, Cecilia

2015

Combinatorics, probability & computing, Vol. 24, (3) : 528-550

Falgas-Ravry, Victor

2015

SIAM Journal on Discrete Mathematics, Vol. 29, (3) : 1504-1539

Falgas-Ravry, Victor; Marchant, Edward; Pikhurko, Oleg; et al.

2014

Journal of Combinatorics, Vol. 5, (3) : 335-354

Falgas-Ravry, Victor; Kittipassorn, Teeradej; Korándi, Dániel; et al.

2013

Electronic Journal of Probability, Vol. 18, (paper 83) : 1-22

Falgas-Ravry, Victor

2013

The Electronic Journal of Combinatorics, Electronic Journal of Combinatorics 2013, Vol. 20, (4) : Article number: P28-

Falgas-Ravry, Victor

2013

Combinatorics, probability & computing, NEW YORK, NY, USA: Cambridge University Press 2013, Vol. 22, (1) : 21-54

Falgas-Ravry, Victor; Vaughan, Emil R.

2012

Advances in Applied Probability, Applied Probability Trust 2012, Vol. 44, (3) : 617-634

Falgas-Ravry, Victor; Walters, Mark

2012

The Electronic Journal of Combinatorics, Newark: The Electronic Journal of Combinatorics 2012, Vol. 19, (3) : P40-

Ravry, Victor Falgas; Vaughan, Emil R.

2011

The Electronic Journal of Combinatorics, Electronic Journal of Combinatorics 2011, Vol. 18, (1) : P95-

Falgas-Ravry, Victor

Head of research

Discrete Mathematics
1 January 2017 until 31 December 2021

**Thesis supervision**

I am happy to supervise both bachelor's and master's theses in discrete mathematics and probability theory. I have a wide selection of possible topics to suggest to students. If interested, please send me an email or come by my office for a chat!

**Reading courses**

I can offer a number of reading courses within my areas of expertise (combinatorics and probability theory), as well as in some related areas of mathematics (functional analysis, number theory, ergodic theory, topology). If interested, please send me an email or come by my office for a chat.