12 March 2026

  • [SOR] How to determine relevant control parameter values of distributional ambiguity sets? | Filipe Manuel Goncalves Rodrigues (Lisbon School of Economics and Management (ISEG))

    12 March 2026 - 14:30 - 15:30
    NOVA FCT, EDF II-Sala 115

    Abstract

    Two-stage distributionally robustoptimization (DRO) is a recent optimization technique for handling uncertainty.It is less conservative than robust optimization and more flexible thanstochastic programming. In DRO, the probability distribution of uncertainparameters is assumed to be unknown but to belong to a prescribed ambiguityset. The size of the ambiguity set is frequently governed by a single parameterthat controls the level of conservatism of the resulting optimization problem.Determining appropriate values for this parameter is therefore a key researchchallenge. In this talk, we first introduce a DRO model for the berthallocation problem with uncertain handling times, which is one of the most importantproblems in port terminals. Then, we present methods for identifying suitablevalues of the ambiguity-set control parameter used in the DRO model. Thosevalues are expected to enable us to obtain all relevant first-stage solutionsworth considering.

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  • [SAn] On a Neumann 1-Laplacian Lane-Emden equation and its relationship with relative isoperimetric problems | Delia Schiera (Instituto Superior Técnico, Universidade de Lisboa)

    12 March 2026 - 15:00 - 16:00

    We investigate an eigenvalue problem involving the 1-Laplacian operator on bounded domains with Neumann boundary conditions. The problem is not well posed in standard Sobolev spaces and must be studied in the space of functions of bounded variation, using tools from nonsmooth analysis. We give a geometrical characterization of this eigenvalue in terms of a relative isoperimetric problem. This connection allows us to characterize eigenfunctions in several relevant situations, including C^2 strictly convex domains, and to highlight both uniqueness and symmetry phenomena.

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16 March 2026

  • [SAL] Conjugacy growth and languages in groups | L. Ciobanu (Heriot-Watt University) (Online)

    16 March 2026 - 14:00 - 15:00

    Abstract: In this talk I will give an overview of what is known about conjugacy growth and the formal series associated with it in infinite discrete groups. I will highlight how the rationality (or rather lack thereof) of these series is connected to both the algebraic and the geometric nature of groups such as (relatively) hyperbolic or nilpotent, and how tools from analytic combinatorics can be employed in this context. I will also mention results about the languages of conjugacy representatives in various groups.

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25 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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26 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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27 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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28 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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29 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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30 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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31 March 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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1 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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2 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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3 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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4 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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5 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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6 April 2026

  • [VAL] Charles Johnson (The College of William & Mary, Williamsburg, Virginia, USA)

    25 March 2026 - 6 April 2026 - 

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