BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Discrete Mathematics Group - ECPv5.1.4//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Discrete Mathematics Group
X-ORIGINAL-URL:https://dimag.ibs.re.kr
X-WR-CALDESC:Events for Discrete Mathematics Group
BEGIN:VTIMEZONE
TZID:Asia/Seoul
BEGIN:STANDARD
TZOFFSETFROM:+0900
TZOFFSETTO:+0900
TZNAME:KST
DTSTART:20200101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200826T103000
DTEND;TZID=Asia/Seoul:20200826T233000
DTSTAMP:20200707T113822
CREATED:20200629T004929Z
LAST-MODIFIED:20200630T004902Z
UID:2576-1598437800-1598484600@dimag.ibs.re.kr
SUMMARY:Nick Brettell\, TBA
DESCRIPTION:
URL:https://dimag.ibs.re.kr/event/2020-08-26/
LOCATION:Zoom
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200824
DTEND;VALUE=DATE:20200829
DTSTAMP:20200707T113822
CREATED:20191122T084127Z
LAST-MODIFIED:20200427T082500Z
UID:1878-1598227200-1598659199@dimag.ibs.re.kr
SUMMARY:2020 IBS Workshop on Extremal and Probabilistic Combinatorics (postponed)
DESCRIPTION:Date\nAugust 24\, 2020 – August 28\, 2020 \nArrival: August 23 Sunday. Departure: August 29\, Saturday \nVenue\nInstitute for Basic Science\, 55 Expo-ro\, Yuseong-gu\, Daejeon\, South Korea \nInvited Speakers\n\nJulia Böttcher\, London School of Economics\nBoris Bukh\, Carnegie Mellon University\nAmin Coja-Oghlan\, Goethe University\nDavid Conlon\, Caltech\nPenny Haxell\, University of Waterloo\nHao Huang\, Emory University\nJeff Kahn\, Rutgers University\nAlexandr V. Kostochka\, University of Illinois at Urbana-Champaign\nMichael Krivelevich\, Tel-Aviv University\nMichał Karoński\, Adam Mickiewicz University in Poznań\nAnita Liebenau\, UNSW Sydney\nHong Liu\, University of Warwick\nTomasz Łuczak\, Adam Mickiewicz University in Poznań\nRichard Montgomery\, University of Birmingham\nTobias Müller\, Groningen University\nPéter Pál Pach\, Budapest University of Technology and Economics\nMathias Schacht\, University of Hamburg\nAsaf Shapira\, Tel-Aviv University\nJoel Spencer\, New York University\nVan Vu\, Yale University\nYufei Zhao\, MIT\nThis list is incomplete. It is subject to change.\n\nAccommodation\nLotte City Hotel and Hotel ICC are within 700m. Invited speakers will be provided an accommodation at the near-by hotels. \nOrganizers\n\nMihyun Kang\, Graz University of Technology\, Austria.\nJaehoon Kim\, KAIST\, Korea.\nSang-il Oum\, IBS Discrete Mathematics Group\, Korea and KAIST\, Korea.\n\n
URL:https://dimag.ibs.re.kr/event/2020-ibs-workshop/
LOCATION:Room B234\, IBS (기초과학연구원)
CATEGORIES:Workshops and Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200819T163000
DTEND;TZID=Asia/Seoul:20200819T173000
DTSTAMP:20200707T113822
CREATED:20200629T004729Z
LAST-MODIFIED:20200702T014301Z
UID:2573-1597854600-1597858200@dimag.ibs.re.kr
SUMMARY:Gwenaël Joret\, Packing and covering balls in graphs excluding a minor
DESCRIPTION:In 2007\, Chepoi\, Estellon\, and Vaxès conjectured that there exists a universal constant $c>0$ such that the following holds for every positive integers $r$ and $k$\, and every planar graph $G$: Either $G$ contains $k$ vertex-disjoint balls of radius $r$\, or there is a subset of vertices of size at most $c k$ meeting all balls of radius $r$ in $G$. The key aspect of this conjecture is that the constant $c$ does not depend on the radius $r$ of the balls. If we were to allow this dependency\, then the statement is known to hold\, and in fact it is true in the more general setting of graph classes with bounded expansion (as proved by Dvořák). \nIn this talk I will present a proof of this conjecture. The result we prove is a bit more general: (1) The conjecture holds for every proper minor-closed class of graphs (with the constant $c$ depending on the class)\, and (2) we can even focus on any set of balls in the graph we like\, there is nothing special about taking all balls of a given radius. In other words\, we show that for every proper minor-closed class $C$ of graphs\, there exists a constant $c>0$ such that for every graph $G$ in $C$\, every set $S$ of balls in $G$\, and every positive integer $k$\, either there are $k$ vertex-disjoint balls in $S$\, or there is a subset of vertices of $G$ of size at most $c k$ meeting all balls in $S$. \nJoint work with Nicolas Bousquet\, Wouter Cames van Batenburg\, Louis\nEsperet\, William Lochet\, Carole Muller\, and François Pirot. \n
URL:https://dimag.ibs.re.kr/event/2020-08-19/
LOCATION:Zoom
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200810
DTEND;VALUE=DATE:20200814
DTSTAMP:20200707T113822
CREATED:20200221T012853Z
LAST-MODIFIED:20200427T014651Z
UID:2145-1597017600-1597363199@dimag.ibs.re.kr
SUMMARY:Nonlinear Algebra in Daejeon (Postponed)
DESCRIPTION:Program\n\nSummer School @ KAIST (August 4-7\, 2020)\nDiscussion Weekend (August 8-9\, 2020)\nWorkshop @ IBS Science Culture Center (August 10-13\, 2020)\n\nWebsite: https://dimag.ibs.re.kr/home/nonlinear/ \nOrganizing Committee\n\nInsong Choe (Konkuk U.)\nKangjin Han (DGIST)\nDavid Hyeon (SNU)\nSijong Kwak (KAIST)\nYongnam Lee (KAIST)\nAnton Leykin (Georgia Tech)\nSang-il Oum (IBS & KAIST)\nFrank Sottile (TAMU)\n\n
URL:https://dimag.ibs.re.kr/event/nonlinear-algebra-in-daejeon/
LOCATION:IBS Science Culture Center
CATEGORIES:Workshops and Conferences
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200805T163000
DTEND;TZID=Asia/Seoul:20200805T173000
DTSTAMP:20200707T113822
CREATED:20200629T004613Z
LAST-MODIFIED:20200630T004927Z
UID:2570-1596645000-1596648600@dimag.ibs.re.kr
SUMMARY:Robert Ganian\, Solving Integer Linear Programs by Exploiting Variable-Constraint Interactions
DESCRIPTION:Integer Linear Programming (ILP) is among the most successful and general paradigms for solving computationally intractable optimization problems in computer science. ILP is NP-complete\, and until recently we have lacked a systematic study of the complexity of ILP through the lens of variable-constraint interactions. This changed drastically in recent years thanks to a series of results that together lay out a detailed complexity landscape for the problem centered around the structure of graphical representations of instances. The aim of this talk is to summarize these recent developments and put them into context. Special attention will be paid to the structural parameter treedepth\, and at the end of the talk we will also consider how treedepth can be used to design algorithms for problems beyond ILP. \n
URL:https://dimag.ibs.re.kr/event/2020-08-05/
LOCATION:Zoom
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200729T163000
DTEND;TZID=Asia/Seoul:20200729T173000
DTSTAMP:20200707T113822
CREATED:20200629T004429Z
LAST-MODIFIED:20200630T004943Z
UID:2567-1596040200-1596043800@dimag.ibs.re.kr
SUMMARY:Akansha Agrawal\, Polynomial Kernel for Interval Vertex Deletion
DESCRIPTION:Given a graph G and an integer k\, the Interval Vertex Deletion (IVD) problem asks whether there exists a vertex subset S of size at most k\, such that G-S is an interval graph. A polynomial kernel for a parameterized problem is a polynomial time preprocessing algorithm that outputs an equivalent instance of the problem whose size is bounded by a polynomial function of the parameter. The existence of a polynomial kernel for IVD remained a well-known open problem in Parameterized Complexity. In this talk we look at a sketch of a polynomial kernel for the problem (with the solution size as the parameter). To illustrate one of the key ingredients of our kernel\, we will look at a polynomial kernel for IVD\, when parameterized by the vertex cover number. \n
URL:https://dimag.ibs.re.kr/event/2020-07-29/
LOCATION:Zoom
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200722T163000
DTEND;TZID=Asia/Seoul:20200722T173000
DTSTAMP:20200707T113822
CREATED:20200629T004204Z
LAST-MODIFIED:20200630T004948Z
UID:2563-1595435400-1595439000@dimag.ibs.re.kr
SUMMARY:Paloma T. Lima\, Graph Square Roots of Small Distance from Degree One Graphs
DESCRIPTION:Given a graph class $\mathcal{H}$\, the task of the $\mathcal{H}$-Square Root problem is to decide whether an input graph G has a square root H that belongs to $\mathcal{H}$. We are interested in the parameterized complexity of the problem for classes $\mathcal{H}$ that are composed by the graphs at vertex deletion distance at most $k$ from graphs of maximum degree at most one. That is\, we are looking for a square root H that has a modulator S of size k such that H-S is the disjoint union of isolated vertices and disjoint edges. We show that different variants of the problems with constraints on the number of isolated vertices and edges in H-S are FPT when parameterized by k\, by providing algorithms with running time $2^{2^{O(k)}}\cdot n^{O(1)}$. We further show that the running time of our algorithms is asymptotically optimal and it is unlikely that the double-exponential dependence on k could be avoided. In particular\, we prove that the VC-k Root problem\, that asks whether an input graph has a square root with vertex cover of size at most k\, cannot be solved in time $2^{2^{o(k)}}\cdot n^{O(1)}$ unless the Exponential Time Hypothesis fails. Moreover\, we point out that VC-k Root parameterized by k does not admit a subexponential kernel unless P=NP. \nThis is a joint work with Petr Golovach and Charis Papadopoulos. \n
URL:https://dimag.ibs.re.kr/event/2020-07-22/
LOCATION:Zoom
CATEGORIES:Virtual Discrete Math Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Seoul:20200721T163000
DTEND;TZID=Asia/Seoul:20200721T173000
DTSTAMP:20200707T113822
CREATED:20200519T123058Z
LAST-MODIFIED:20200629T010307Z
UID:2456-1595349000-1595352600@dimag.ibs.re.kr
SUMMARY:Ilkyoo Choi (최일규)\, Flexibility of Planar Graphs
DESCRIPTION:Oftentimes in chromatic graph theory\, precoloring techniques are utilized in order to obtain the desired coloring result. For example\, Thomassen’s proof for 5-choosability of planar graphs actually shows that two adjacent vertices on the same face can be precolored. In this vein\, we investigate a precoloring extension problem formalized by Dvorak\, Norin\, and Postle named flexibility. Given a list assignment $L$ on a graph $G$\, an $L$-request is a function on a subset $S$ of the vertices that indicates a preferred color in $L(v)$ for each vertex $v\in S$. A graph $G$ is $\varepsilon$-flexible for list size $k$ if given a $k$-list assignment $L$ and an $L$-request\, there is an $L$-coloring of $G$ satisfying an $\varepsilon$-fraction of the requests in $S$. We survey known results regarding this new concept\, and prove some new results regarding flexibility of planar graphs. \n
URL:https://dimag.ibs.re.kr/event/2020-07-21/
LOCATION:Room B232\, IBS (기초과학연구원)
CATEGORIES:Discrete Math Seminar
END:VEVENT
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