## Events in November–December 2021

MonMonday | TueTuesday | WedWednesday | ThuThursday | FriFriday | SatSaturday | SunSunday |
---|---|---|---|---|---|---|

November 1, 2021 | November 2, 2021 | November 3, 2021 | November 4, 2021 | November 5, 2021 | November 6, 2021 | November 7, 2021 |

November 8, 2021 | November 9, 2021 | November 10, 2021 | November 11, 2021 | November 12, 2021 | November 13, 2021 | November 14, 2021 |

November 15, 2021 | November 16, 2021 | November 17, 2021 |
November 18, 2021(2 events)
## Polaris-tt : Thomas Barzola ("reproducible" optimization of bike sharing systems)## Polaris-tt : Thomas Barzola ("reproducible" optimization of bike sharing systems) – ## Seminar Bruno Gaujal: "Markov Decision Processes: from discrete time/finite horizon to continuous time/infinite state space/infinite horizon."## Seminar Bruno Gaujal: "Markov Decision Processes: from discrete time/finite horizon to continuous time/infinite state space/infinite horizon." – Batiment IMAG (Room 306) |
November 19, 2021 | November 20, 2021 | November 21, 2021 |

November 22, 2021 | November 23, 2021 | November 24, 2021 |
November 25, 2021(2 events)
## Seminar Fryderyk Falniowski: Chaotic behavior in congestion games## Seminar Fryderyk Falniowski: Chaotic behavior in congestion games – Abstract: [1] P. Coucheney, B. Gaujal, P. Mertikopoulos. "Penalty-regulated dynamics and robust learning procedures in games." Mathematics of Operations Research 40.3 (2015): 611-633. ## Seminar "Positive solutions for large random linear systems - application to theoretical ecology" by Jamal Najim## Seminar "Positive solutions for large random linear systems - application to theoretical ecology" by Jamal Najim – Large Lotka-Volterra (LV) systems of coupled differential equations is a popular model to describe the dynamics and equilibrium of the abundances of large populations in interaction such as foodwebs for instance. For such large LV systems, calibrating the interaction coefficients between the coupled equations is a highly difficult task that people often circumvent by considering instead random coefficients.
In this talk, we will describe feasible equilibria for such systems. By feasible equilibrium, we mean an equilibrium with no vanishing species. The study of such an equilibrium amounts to finding a positive solution to a simple large linear equation involving a large random matrix. We will describe solutions for various models: fully random (i.i.d.), sparse, correlated.
Key words are: Theoretical ecology, random Matrix Theory, concentration of measure, extreme values. Reference: arXiv:1904.04559
Joint work with I. Akjouj, P. Bizeul, M. Clénet, H. El Ferchichi.
Bâtiment IMAG (206) |
November 26, 2021 | November 27, 2021 | November 28, 2021 |

November 29, 2021 | November 30, 2021 | December 1, 2021 |
December 2, 2021(1 event)
## Polaris-tt: Chen Yan## Polaris-tt: Chen Yan – |
December 3, 2021 | December 4, 2021 | December 5, 2021 |

**November 25, 2021 @ Bâtiment IMAG (206)****-- Seminar "Positive solutions for large random linear systems - application to theoretical ecology" by Jamal Najim**Large Lotka-Volterra (LV) systems of coupled differential equations is a popular model to describe the dynamics and equilibrium of the abundances of large populations in interaction such as foodwebs for instance. For such large LV systems, calibrating the interaction coefficients between the coupled equations is a highly difficult task that people often circumvent by considering instead random coefficients.In this talk, we will describe feasible equilibria for such systems. By feasible equilibrium, we mean an equilibrium with no vanishing species. The study of such an equilibrium amounts to finding a positive solution to a simple large linear equation involving a large random matrix. We will describe solutions for various models: fully random (i.i.d.), sparse, correlated.Key words are: Theoretical ecology, random Matrix Theory, concentration of measure, extreme values. Reference: arXiv:1904.04559Joint work with I. Akjouj, P. Bizeul, M. Clénet, H. El Ferchichi.**December 2, 2021 @****-- Polaris-tt: Chen Yan****December 9, 2021 @****-- Polaris-tt: Till Kletti (Introducing the expohedron for fair and useful rankings)**