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Graphs, ALgorithms and Combinatorics (GALaC)


The GALAC team gathers the researchers from LRI who jointly investigate problems of combinatorics, algorithms, graph theory or networked and distributed systems.

More in depth, the main focus of our research activities is on the following: the combinatorics activity studies the strong interactions and relations that exist between algorithms and algebraic structures. At the same time, graph structures constitute the core of the research of the graph theory activity, which is mainly focused on both structural and algorithmic approach. Efficient algorithms and models for networked systems are designed in the third activity, using theoretical tools like algorithmic game theory and distributed computing.

Group Members
  Group leader
    COHEN Johanne

  Faculty
    CHEN Lin
    COHEN Johanne
    COHEN Nathann
    DELAËT Sylvie
    DEZA Antoine
    DJELLOUL Selma
    FIORENZI Francesca
    FLANDRIN Evelyne
    FORGE David
    HELLOUIN de MENIBUS Benjamin
    HIVERT Florent
    LI Hao
    LOBSTEIN Antoine
    MANOUSSAKIS Yannis
    MARTIGNON Fabio
    PONS Viviane
    RIMMEL Arpad
    THIÉRY Nicolas
    TOMASIK Joanna
    WEISSER Marc-Antoine

  Non-permanent research staff
    BERGE Pierre
    BRAY Erik
    DAMBREVILLE Alexandre
    FALQUE Justine
    GAY Joël
    LE GUIBAN Kaourintin
    MANO Mattias
    MORCOS Mira
    PHAM Hong Phong
    PILORGET Benoit
    RABE Florian
    SHI Hehuan
    TIAN Zengxian

  Partners
    AUGER David
    COUCHENEY Pierre
    DE FEO Luca
    de LAVENERE Vincent
    ELIAS Jocelyne
    FOURNEAU Jean-Michel
    HELIOU Amélie
    PALI Nefton
    RODIER Lise

Research activities
  Combinatorics
  Graph Theory
  Algorithms for networked systems

Software & patents
  Cartaj: Classification Of RNA threeway Junctions
  Sage-Combinat: To improve the open source mathematical system Sage
  Sage: A free open-source mathematics software system
  aSHIIP: A random topology generator of interdomain

Recent Ph.D. dissertations & faculty habilitations
  Combinatorial Algorithms and Optimization
  Algorithm Design and Analysis in Wireless Networks
  A few algorithmic and complexity problems in graph theory

Seminars
A Two-level Auction for Resource Allocation in Multi-tenant C-RAN
Mira Morcos
9 March 2018 14h30


Binary pattern of length greater than 14 are abelian-2-avoidable
Matthieu Rosenfeld
9 February 2018 14h30


A concurrent lock-free algorithm for computing a finite semigroup
James Mitchell
12 January 2018 14h30


Computing the growth rate of the number of patterns in a tiling
Benjamin Hellouin
22 December 2017 14h30


Cycles dans les produits cartésiens de graphes
Evelyne Flandrin
1 December 2017 14h30


2017-04-28
Evelyne Flandrin
28 April 2017 14h30


Lattice polytopes with large diameter and many vertices
Antoine Deza
31 March 2017 14h30


Euler Polytopes and Convex Matroid Optimization
George Manoussakis
25 March 2016 14h30


Multi-armed bandit for distributed inter-cell interference coordination.
Johanne Cohen
29 January 2016 14h30


Locating pairs of vertices on Hamiltonian cycles
Hao Li
22 January 2016 14h30


Approximate Consensus in Highly Dynamic Networks
Bernadette Charron-Bost
10 April 2015 10h00


Marches aléatoires dans les réseaux dynamiques : auto-stabilisation et mécanismes probabiliste
Devan Sohier,
27 March 2015 14h30


Degree-Constrained Graph Orientation: Maximum Satisfaction and Minimum Violation
Hirotaka Ono
13 February 2015 14h30


Solving Matching Problems Efficiently in Bipartite Graphs
Selma Djelloul
31 January 2015 14h30


Self-stabilizing local k-placement of replicas with minimal variance.
Volker Turau
8 December 2014 15h30


2-distance coloring of not-so-sparse graphs.
Clement Charpentier
16 May 2014 14h30


Sur la structure palindromique des mots
Srecko Brlek
9 May 2014 14h30


Distributed Selfish Algorithms for Max-Cut game.
Lise Rodier
11 April 2014 10h30


Cycles in line graphs and the preimage graphs
Kiyoshi Yoshimoto
28 March 2014 14h30


Intervals of the Tamari lattice.
Viviane Pons
28 March 2014 10h30


Combinatoire et algorithmique dans les classes de permutations à motifs exclus.
Adeline Pierrot
14 March 2014 10h30


On Kinetic Delaunay Triangulations
Natan Rubin
7 February 2014 11h00


Finding an odd hole through two vertices of a planar graph in polynomial time
Marcin Kamiński
7 February 2014 10h00


Résultats majeurs
Software & patents