Midsummer Combinatorial Workshop XXV

August 3 - August 7, 2020, Prague

Programme (tentative)

All lectures take place in room S5 at the building of Charles University, Malostranske namesti 25.
Morning Registration
9:00-9:20 Welcome, brief information about program of the workshop
9:25-9:55Peter CameronLockdown theorem
10:00-10:30Coffee break
10:30-11:00Pavel PatakBetter bounds for abstract Radon theorem
11:10-11:40Vaclav RozhonDeterministic network decomposition
11:50-12:20Jan HubickaBig Ramsey degrees using parameter spaces
9:00-9:30Lluis VenaCompactification of the set of positive sentences with applications to graph limits
9:30-10:00Jan VolecNon-bipartite k-common graphs
10:00-10:30Coffee break
10:30-11:00Jan GrebikEntropy inequality and divisibility of spheres
11:10-11:40Ida KantorUNCE day talk: Souvenirs from Manhattan
11:50-12:20Jaroslav NesetrilEPPA & Ramsey
9:00-9:30Martin BalkoUNCE day talk: On ordered Ramsey numbers of tripartite 3-uniform hypergraphs
9:30-10:00Petr ChmelOn recognizing and 3-colouring L-graphs
10:00-10:30Coffee break
10:30-11:00Roman NedelaCyclic connectivity in cubic graphs
11:10-11:40Michaela SeifrtovaOn the Existence of a Coherent Decycling Partition in Cubic Graphs
11:50-12:20Zuzana PatakovaBarycentric cuts through a convex body
9:00-9:30Antoine MottetCores over Ramsey structures
9:30-10:00Carl FeghaliRevisiting a theorem of Talbot
10:00-10:30Coffee break
10:30-11:00Denys BulavkaOptimal bounds for the colorful fractional Helly theorem
11:10-11:40Johanna WieheThe chromatic polynomial of a digraph
11:50-12:20Matej KonecnyOn EPPA numbers of graphs
9:30-10:00Peter ZemanTesting isomorphism of circular-arc graphs
10:00-10:30Coffee break
10:30-11:00David ChodounskyRamsey and other generic ultrafilters
11:10-11:40Jan GrebikFractional isomorphism of graphons


The workshop continues the tradition of Prague Combinatorial Workshops held since 1993. Oriented on problems of all fields of graph theory, combinatorics and discrete geometry, it will continue in the spirit and informal working atmosphere of the previous meetings.

The workshop takes place at DIMATIA and the Department of Applied Mathematics of Charles University, Malostranske namesti 25, Prague 1, which is located in a historic building in the center of Old Prague. The workshop is also supported by Computer Science Institute of Charles University.

The workshop participation is by invitation only. Regardless, if you wish to participate, please email the organizers and we will respond to you shortly. In case you need an invitation letter (for example for your visa), please let us know and we will be happy to write one for you.

Coffee breaks and part of the meals are provided by the organizers. However, we will collect a modest fee of EUR 70 towards a fraction of the expenses.

As is the tradition, the program of the workshop is determined from day to day. The afternoons are reserved for discussions and other activities. If you intend to give a talk during the MCW, please let us know a few days in advance.

If you arrive later during the workshop, please register with the secretaries in the room 222 (at the 2nd floor).

On Wednesday afternoon, there will be an awesome social event.

This workshop is part of a project that has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No 810115)


Besides the workshop itself, you are free to use the following facilities of our departments:

If you need anything else, contact the organizers.

Travel info (public transport)

For the public transportation you can buy a 90-minute ticket for 32 CZK or 30-minute for 24 CZK in a newsstand or in a vending machine. The vending machines only accept coins (no credit cards, no paper money).

The ticket needs to be validated (in a magic yellow validating machine with a shining arrow). The validating machines are located inside buses and trams. In the Metro subway system, the machine is located at the entryway to the station.

If you need to find a tram connection, you can use the official website. The department building is located near the tram stop "Malostranske namesti". You can see it from the tram stop. It is this building.

Useful routes:

Airport -> Marianeum Hotel

Marianeum Hotel -> MCW

Airport -> Karolinum Hotel

Karolinum Hotel -> MCW


All e-mail correspondence concerning the workshop (e.g. registration, accommodation) should be directed to mcw@kam.mff.cuni.cz.

organizers: Jaroslav Nesetril, Jan Hubicka, Matej Konecny


Previous Workshops

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