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Results for criterions: Author: HUDRY Olivier Modify search criterions Results n° 1 to 8 of 27 matches Page 1 . 2 . 3 . 4 . >> Next page Title Foreword : Mathematical psychology Author HUDRY Olivier Keywords None Topic None Abstract Foreword Number 199, Fall 2012, special issue: Mathematical psychology Language   French Read the article Title Foreword to the special issue: Tribute to Jean-Pierre Barthélemy Author HUDRY Olivier Keywords None Topic None Abstract Number 197, Spring 2012, special issue: Categories, classification, complexity, consensus ... Around Jean-Pierre Barthélemy's works Language   French Read the article Title NP-hardness of the computation of a median equivalence relation in classification (Régnier’s problem) Author HUDRY Olivier Keywords Aggregation of relations, Classification, Complexity, Equivalence relation, Median relation, NP-completeness, Partition, Régnier's problem, Symmetric difference distance, Zahn's problem Topic None Abstract Given a collection Π of equivalence relations (or partitions), Régnier’s problem consists in computing an equivalence relation which minimizes the remoteness from Π. The remoteness is based on the symmetric difference distance and measures the number of disagreements between Π and the considered equivalence relation. Such an equivalence relation minimizing the remoteness is called a median equivalence relation of Π. We prove the NP-hardness of Régnier’s problem, i.e. the computation of a median equivalence relation of a collection of equivalence relations, at least when the number of equivalence relations of Π is large enough. Number 197, Spring 2012, special issue: Categories, classification, complexity, consensus ... Around Jean-Pierre Barthélemy's works Language  English Read the article Title Alain Hertz, "L'agrapheur. Intrigues policières à saveur mathématique", Presses internationales Polytechnique, Montréal, Canada, 2010 Author HUDRY Olivier Keywords None Topic Book review Abstract Book review Number 191, Fall 2010, special issue: Variability and inequalities Language   French Read the article Title Foreword to the special issue : Discrete mathematics: theories and uses. Tribute to Bruno Leclerc Author HUDRY Olivier, MONJARDET Bernard Keywords None Topic None Abstract Number 190, Summer 2010, special issue: Theories and uses. Tribute issue to Bruno Leclerc Language   French Read the article Title Consensus theories, an oriented survey Author MONJARDET Bernard, HUDRY Olivier Keywords Aggregation rule, Arrowian result, Complexity, Consensus theory, Distance, Lower valuation, Median semilattice, Médiane, Restricted domain, Tournament solution Topic None Abstract This article surveys seven directions of consensus theories: Arrowian results, federation consensus rules, metric consensus rules, tournament solutions, restricted domains, abstract consensus theories, algorithmic and complexity issues. This survey is oriented in the sense that it is mainly - but not exclusively - concentrated on the most significant results obtained, sometimes with other researchers, by a team of French researchers who are or were full or associate members of the Centre d'analyse et de mathématique sociale (CAMS). Number 190, Summer 2010, special issue: Theories and uses. Tribute issue to Bruno Leclerc Language  English Read the article Title Nathalie Caspard, Bruno Leclerc, Bernard Monjardet, "Ensembles ordonnés finis : concepts, résultats et usages", Springer, Berlin, Heidleberg, 2007. Author HUDRY Olivier Keywords None Topic None Abstract Book review Number 190, Summer 2010, special issue: Theories and uses. Tribute issue to Bruno Leclerc Language   French Read the article Title 2007 Meeting of the French-speaking Society of Classification Author CHARON Irène, HÈBRAIL Georges, HUDRY Olivier Keywords None Topic None Abstract Foreword Number 187, Fall 2009, special issue: 2007 Meeting of the French-speaking Society of Classification Language   French Read the article Page 1 . 2 . 3 . 4 . >> Next page Users rights : The entire journal is licensed under a Creative Commons license