HOSIGRA

• 16-18 June 2023, Gabor Tardos visited IRIF.
  
  
• 12-24 June 2023, Gabor Simonyi visited IRIF.
  
  
• 16-23 April 2023, Sagar Sudhirkumar Sawant, Ph.D. student from IIT-Madras, visited IRIF.
  
  
• 03 March 2023-30 June 2023, Anna Gujgiczer, Pu.D. student from BME Budapest, visited IRIF.
  
  
• 23-25 June 2021, David Roberson visited IRIF.

Online annual meeting, 3-5 May 2021

An online 3 day meeting merged with project IFCAM and a research course on coloring of signed graphs at ZJNU. The focus of the meeting will be students presenting their research work.

• Online annual meeting, 12 May 2020

A 2 hour online meeting for activity reports by the members of the project.

• 19-23 August 2019

Petry Valicov visited IRIF. In collaboration with two other visitors, Narayanan and Suchismita Mishra and the host (Naserasr) they worked on exact distance two coloring problem.

• 31 March 2019-05 April 2019
  The second annual meeting of the project, to be held at sète montpellier.
  
  Participants: Olivier Baudon, Laurent Beaudou, Dibyayan Chakraborty, Sandip Das, Francois Dross, Kardos Frantisek, Florent Foucaud, Penny Haxell, Herve Hocquard, Fabien Jacques, Dimitri Lajou, Valia Mitsou, Mickael Montassier, Soumen Nandi, Jonathan Narboni, Reza Naserasr, Pascal Ochem, Théo Pierron, Alexandre Pinlou, Andre Raspaud, Ben Seamone, Sagnik Sen, Mohammed Senhaji, Eric Sopena, Umakant Sahoo, Peru Valicov, Zhouningxin Wang, Rongxing Xu
  
  
• 8-12 December 2018
  Rsite Skrekovski visited IRIF. During this visit, together Rongxing Xu, Zhouningxing Wang and Reza Naserasr, they worked on the project mapping sparse graph into give targets.
  
  
• 12-23 November 2018
  Florent Foucaud, visiting LABRI, work on Parameterized problems around signed graph homomorphisms with Hervé Hocquard, Dimitri Lajou and Théo Pierron.
  
  
• 25 October 2018
  Alessandra Sarti, visiting IRIF, discussion on intersection graph of lines on algebraic surfaces.
  
  
• 11-12 October 2018
  40 années d'algorithmique de graphes, a conference organized in honor of Michel Habib at IRIF.
  HOSIGRA members attending and organizing: Pierre Charbit, Michel Habib, Reza Naserar, Andre Raspaud, Eric Sopena, Zhouningxin Wan, Rongxing Xu
  
  
• 10-15 October, 2018
  Srecko Brlek, visiting IRIF, as invited speaker of "40 années d'algorithmique de graphes"
  
  
• 9-15 October 2018
  Pavol Hell, visiting IRIF, as invited speaker of "40 années d'algorithmique de graphes"
  
  
• 3-14 October 2018
  Meirun Chen, visiting from Xiamen University of Technology, hosted by IRIF-Paris 7.
  
  
• 4-28 September 2018
  Farzaneh Ramezani, visiting IRIF. Working of complexity of signed graph coloring on graph classes.
  
  
• 16-20 July 2018
  Work meeting in Bordeaux,
  Participants: Dibyayan Chakraborty (ISI Kolkata, India), Sagnik Sen (RMERI Kolkata, India), Eric Sopena
  Subject: K₅-minor free signed cliques
  
  
• 11-15 Juin 2018
  Work meeting in Bordeaux,
  Participants: Florent Foucaud, Herve Hocquard, Reza Naserasr, Eric Sopena, Petru Valicov
  Subject: Coloring square of a graph
  
  
• 28-30 March 2018
  The kick off meeting of the project, hosted by LaBRI-Bordeaux.
  
  Participants: Reza Naserasr, Alexandre Pinlou, Andre Raspaud, Eric Sopena, Marthe Bonamy, Olivier Baudon, Kardos Frantisek, Herve Hocquard, Mohammed Senhaji, Mickael Montassier, Pascal Ochem, Francois Dross, Laurent Beaudou, Valia Mitsou, Lajou Dimitri, Tobias Castanet, Florent Foucaud, Zhouningxin Wang
  
  
• 8th February--1st March 2018
  Meirun Chen visiting from Xiamen University of Technology, hosted by IRIF-Paris 7.
  
  
• 29th January--13th February 2018
  Lalla Mouatadid visiting from U. Toronto, Toronto Canada, hosted by IRIF-Paris 7.