GALaC team at LRI, Paris-Sud
GALaC is a research group at LRI, Paris-Sud University. We are focused on graph theory, combinatorics and network distributed systems algorithmic.
A global presentation of research activities in GALaC was made in 2013 for the AERES evaluation: Slides AERES 2013 and projet.
Recent Posts
Packing many dominating sets in a graph
summary: Given a graph G, a dominating set of G is a subset of vertices S such that every vertex not in S is adjacent to at least one vertex in S. While classical studies focus on finding the smallest dominating set of G, our focus shifts to finding the ...
Decision-Theoretic Approaches in Learning-Augmented Algorithms
summary: We initiate the systematic study of decision-theoretic metrics in the design and analysis of algorithms with machine-learned predictions. We introduce approaches based on both deterministic measures such as distance-based evaluation, that help us quantify how close the algorithm is to an ideal solution, as well as stochastic measures that ...
Faster diameter computation in graphs of bounded Euler genus
Roditty and Vassilevska-Williams [STOC 2013] showed that computing the diameter, i.e., farthest distance between any two vertices, of an (unweighted, undirected) graph cannot be done in subquadratic time unless the Strong Exponential Time Hypothesis fails. In a breakthrough work, Cabello [TALG 2019] showed a subquadratic algorithm in planar graphs ...
Les méandres arcs-en-ciel sur des chemins de Dyck
Un méandre (de longueur n) est une paire de correspondences non-croisées sur {1,...,n}. On peut le représenter sur le plan réel comme un paire d'ensemble de demi-cercles, qui ne s'intersentent pas deux à deux, reliant n points sur une droite. Cette représentation géométrique permet d'introduire différentes ...
Lattice structures of Gog and Magog triangles
summary:
Gog and Magog triangles are simple combinatorial objects which are equienumerated.
Howewer, the problem of finding an explicit bijection between these has been an
open problem since the 80’s. These are related to other interesting objects such
as alternating sign matrices, plane partitions or aztec diamond tillings.
All ...
Translations: fr