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Seminario ENRICO SCALAS @ UniTo
by Federico Polito 29 Oct '15

29 Oct '15

********************************************************************* SEMINARI DI PROBABILITA' E STATISTICA MATEMATICA DIPARTIMENTO DI MATEMATICA "G. PEANO" UNIVERSITA' DEGLI STUDI DI TORINO ********************************************************************* Martedì 10 Novembre 2015 alle ore 14:30 in Aula C presso il Dipartimento di Matematica "G. Peano" dell'Università degli Studi di Torino, Via Carlo Alberto 10, Il Prof. ENRICO SCALAS (Department of Mathematics, University of Sussex, UK) terrà un seminario dal titolo EXACTLY-SOLVABLE NON-MARKOVIAN DYNAMIC NETWORK Abstract: Non-Markovian processes are widespread in natural and human-made systems, yet explicit modelling and analysis of such systems is underdeveloped. In this letter we consider a dynamic network with random link activation and deletion (RLAD) with non-exponential inter-event times. We study a semi-Markov random process when the inter-event times are heavy tailed Mittag-Leffler distributed, thus considerably slowing down the corresponding Markovian dynamics and study the system far from equilibrium. We derive an analytically and computationally tractable system of forward equations utilizing the Caputo derivative for the probability of having a given number of active links in the network. http://journals.aps.org/pre/abstract/10.1103/PhysRevE.92.042801 Tutti gli interessati sono invitati a partecipare. -- Federico Polito Department of Mathematics University of Torino Via Carlo Alberto, 10 10123, Torino, Italy Email: federico.polito(a)unito.it Tel: +39 011 6702937 Web: www.federicopolito.it

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Deadline approaching: Winter School in Padova (February 2016)
by Tiziano Vargiolu 29 Oct '15

29 Oct '15

Dear all, this is to remind you that the deadline for the Winter School "Frontiers in Stochastic Modelling for Finance" is October, 31. For more details, see below and on the Winter School's website http://www.maths.univ-evry.fr/conferences/padova2016/index_ws.htm See you in Padova! Tiziano -------------------------------------------------------------------------- Tiziano Vargiolu Dipartimento di Matematica Phone: +39 049 8271383 Universita' di Padova Fax: +39 049 8271428 Via Trieste, 63 E-mail: vargiolu(a)math.unipd.it I-35121 Padova (Italy) WWW: http://www.math.unipd.it/~vargiolu -------------------------------------------------------------------------- --------------------------------------- Date: Wed, 30 Sep 2015 10:58:14 +0200 From: Giorgia Callegaro <giogiocallegaro(a)gmail.com> To: random(a)mail.dm.unipi.it Subject: [Random] Winter School in Padova (February 2016) Dear all, in collaboration with Evry University, ENSIIE and University Paris Diderot, the Department of Mathematics of the University of Padova (Organizing Committe in Padova: Giorgia Callegaro and Tiziano Vargiolu, Scientific Committe in Padova: Wolfgang J. Runggaldier) is organizing a Winter School on recent advances in Mathematical Finance, that will be held in Padova in the period 8-12 February 2016. Two main courses, on ?Energy Markets? and ?Pricing with Funding and Counterparty Risks? will be given, respectively, by Rene Aid (EdF) and Andrea Pallavicini (Banca IMI and Imperial College). Moreover, four mini-course are scheduled, on longevity risk (Nicole El Karoui), optimal stopping (Goran Peskir), polynomial processes (Martin Larsson) and numerical methods (Nadia Oudjane). More details can be found at the link: http://www.maths.univ-evry.fr/conferences/padova2016/index_ws.htm#section1 Accomodation during the period 7-12 February will provided to a limited number of students (maximum 35) selected among candidates who will send us, via the online form available here: http://www.maths.univ-evry.fr/conferences/padova2016/Application_ws.htm#sec… their CV and recommendation letter before the 31st October 2015. Thanks for your attention and see you in Padova! Giorgia Callegaro on behalf of the Organizing Committee -- Giorgia Callegaro Assistant Professor Department of Mathematics University of Padova Via Trieste 63 , I-35121 Padova - ITALY Tel: +39-0498271481 Fax: +39-0498271499 E-Mail: gcallega(a)math.unipd.it Web-page: https://sites.google.com/site/giogiocallegaro/Home ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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Politecnico di Milano - Seminari Jim Ramsay e Michelle Carey
by Laura M. Sangalli 28 Oct '15

28 Oct '15

Si avvisa che in data 6-11-2015, alle ore 10:30 precise, presso l'Aula Seminari "F. Saleri" VI piano - Dipartimento di Matematica, Politecnico di Milano, nell'ambito delle iniziative MOX, si svolgeranno i seguente seminari: ore 10:30 Jim Ramsay, McGill University, Exploring Functional Data with Dynamic Models ore 11:30 Michelle Carey, McGill University, Data2PDE: an iterative scheme for obtaining data driven estimates of the parameters of PDEs defined over complex domains Seguono gli abstracts dei due seminari. Jim Ramsay Exploring Functional Data with Dynamic Models Discrete observations of curves are often smoothed by attaching a penalty to the error sum of squares, and the most popular penalty is the integrated squared second derivative of the function that fits the data. But it has been known since the earliest days of smoothing splines that, if the linear differential operator D^2 is replaced by a more general differential operator L that annihilates most of the variation in the observed curves, then the resulting smooth has less bias and greatly reduced mean squared error. This talk will show how we can use the data to estimate such an operator. The differential equation estimated in this way is already an interesting model for the data that represents the dynamics of the processes being estimated. But, in addition to the advantages in bias and MSE, it emerges that exciting new ways of representing the data emerge that use an orthogonal basis system defined by the estimated operator. M. Carey Data2PDE: an iterative scheme for obtaining data driven estimates of the parameters of PDEs defined over complex domains Spatial data are abundant in many scientific fields, some examples include; satellite images of the earth, temperature readings from multiple weather stations and the spread of an infectious disease over a particular region. In many instances the spatial data are accompanied by mathematical models expressed in terms of partial differential equations (PDEs). These PDEs determine the theoretical aspects of the behaviour of the physical, chemical or biological phenomena considered. The parameters of the PDEs are typically unknown and must be inferred from expert knowledge of the phenomena considered. In this talk I will discuss extending the profiling with parameter cascading procedure outlined in Ramsay et al (2007) to incorporate PDE parameter estimation. Furthermore, following from Sangalli et al. (2013) the estimation procedure is extended to include nite element methods (FEMs). This allows the proposed method to account for attributes of the geometry of the physical problem such as irregular shaped domains, external and internal boundary features and strong concavities. Thus this talk introduces a methodology for data driven estimates of the parameters of PDEs dened over complex domains. Tutti gli interessati sono invitati a partecipare. Cordiali saluti, Laura Sangalli -- Laura Maria Sangalli MOX - Dipartimento di Matematica Politecnico di Milano Piazza Leonardo da Vinci 32 20133 Milano - Italy tel: +39 02 2399 4554 fax: +39 02 2399 4568 email: laura.sangalli(a)polimi.it url: http://mox.polimi.it/~sangalli

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PIETRO CAPUTO - GIOVEDI 29 - TOR VERGATA - CICLO SEMINARI PASCAL
by Valentina Cammarota 27 Oct '15

27 Oct '15

Ciclo di Seminari - Progetto ERC grant PASCAL (Probabilistic and Statistical Techniques for Cosmological Applications) Giovedi` 29 ottobre ore 15:00 Aula Dal Passo Dipartimento di Matematica Università di Roma Tor Vergata Prof. Pietro Caputo Dipartimento di Matematica e Fisica, Università Roma Tre Titolo: Dynamical phase transition in random lattice triangulations Abstract: We consider lattice triangulations, i.e., triangulations of the integer points in Euclidean plane. Our focus is on random triangulations in which a triangulation \sigma has weight \lambda^{|\sigma|}, where \lambda is a positive real parameter and |\sigma| is the total length of the edges in \sigma. Empirically, this model exhibits a phase transition at \lambda=1 (corresponding to the uniform distribution): for \lambda<1 distant edges behave essentially independently, while for \lambda>1 very large regions of aligned edges appear. We substantiate this picture as follows. For \lambda<1 sufficiently small, we show that correlations between edges decay exponentially with distance (suitably defined), and also that the Glauber dynamics, namely the local Markov chain based on flipping edges, is rapidly mixing (in time polynomial in the number of edges in the triangulation). By contrast, for \lambda>1 we show that the mixing time is exponential. For thin rectangular regions we obtain sharp mixing time bounds for all values of \lambda<1. This is joint work with F. Martinelli, A. Sinclair and A. Stauffer Tutti gli interessati sono invitati a partecipare. . Valentina Cammarota Department of Mathematics Universita` degli Studi di Roma Tor Vergata http://www.mat.uniroma2.it/english.php https://sites.google.com/site/valentinacammarota/

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Doctoral Seminar at LUISS
by Marco Scarsini 27 Oct '15

27 Oct '15

This is to invite you to our next doctoral seminar, on Thursday, October 29th, from 13:00 to 14:00 in room 405b. The speakers is Anna Zseleva (Maastricht University). The work presented will be: Title: Zero-sum games with charges Abstract: We consider two-player zero-sum games with infinite action spaces and bounded payoff functions. The players' strategies are finitely additive probability measures, called charges. Since a strategy profile does not always induce a unique expected payoff, we distinguish two extreme attitudes of players. A player is viewed as pessimistic if he always evaluates the range of possible expected payoffs by the worst one, and a player is viewed as optimistic if he always evaluates it by the best one. This approach results in a definition of a pessimistic and an optimistic value for each player. We provide an extensive analysis of the relation between these values, and connect them to the classical values. In addition, we also examine existence of optimal strategies with respect to these values. Updated calendar of our seminars at: http://ricerca.economiaefinanza.luiss.it/calendar ******************************************************* Marco Scarsini Dipartimento di Economia e Finanza LUISS Viale Romania 32 00197 Roma, ITALY URL: http://docenti.luiss.it/scarsini/

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DRM 2015 - final program
by Fabio Bellini 27 Oct '15

27 Oct '15

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seminario di Pablo Rodriguez a Milano-Bicocca
by daniela.bertacchi 26 Oct '15

26 Oct '15

~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ ANNUNCIO DI SEMINARIO ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~ Il giorno 30 ottobre 2015, alle ore 14 in aula 2109 del Dipartimento di matematica e Applicazioni dell'Università di Milano-Bicocca, il dott. PABLO RODRIGUEZ (Department of Applied Math. and Statistics, Universidade de Sao Paulo. Sao Carlos, Brazil.) terrà un seminario dal titolo PHASE TRANSITIONS IN SOME STOCHASTIC TOY-MODELS. Abstract: The aim of the talk is to discuss about the formulation and phase transition results regarding three stochastic toy-models. More precisely, we consider a modified ErdosRényi random graph, an accessibility percolation model on trees and an interacting particle system on Zd. We will discuss about motivation, results, open problems, and some ideas for the proofs. Tutti gli interessati sono invitati a partecipare Daniela Bertacchi ********************************************* * Daniela Bertacchi * Dipartimento di Matematica e Applicazioni * Università di Milano-Bicocca * Via Cozzi 53 * 20125 Milano * * Tel. +39 0264485716 * Fax +39 0264485705 * email: daniela.bertacchi(a)unimib.it * http://www.matapp.unimib.it/~bertacchi *********************************************

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Postdoc on Models and algorithms for large networks from Big Data
by Fabrizio Lillo 26 Oct '15

26 Oct '15

The call for a two-year postdoc is open at the Scuola Normale Superiore di Pisa (Italy). The topic of the research is *Models and algorithms for large networks from Big Data”* under the following EU project: *“SoBigData Research Infrastructure”, *Acronym “*SoBigData*” (call H-2020-INFRAIA-2014-2015). The details of the call are at http://www.sns.it/en/servizi/job/assegnidiricerca/assegno502/ The research fellow shall carry out the following activities: study and implementation of models and algorithms for the study and inference of large complex networks of social, economic, financial, and computational origin; networks from time series; social pattern discovery; empirical analysis of Big Data. The deadline is November 9. I would be grateful if you could forward this message to any potentially interested candidate. The interested candidates can either contact me (fabrizio.lillo(a)sns.it) or the addresses in the call in case they need further information. Thanks and all the best, Fabrizio Lillo ---------------------------------------- Fabrizio Lillo Scuola Normale Superiore di Pisa Piazza dei Cavalieri 7 56126 Pisa ITALY Check the new website: fabriziolillo.wordpress.com phone: +39 050509159

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LUISS Seminar_28/10 Alessandro Arlotto
by Marco Scarsini 26 Oct '15

26 Oct '15

The next Research Seminar of Economics and Finance Dept. is scheduled for Wednesday, October 28th , from 2.30 p.m. to 4.00 p.m., room 205/a, viale Romania. Our guest speaker will be Prof. Alessandro Arlotto (Duke University), who will held a lecture titled “Markov Decision Problems Where Means Bound Variances” Abstract We identify a rich class of finite-horizon Markov decision problems (MDPs) for which the variance of the optimal total reward can be bounded by a simple linear function of its expected value. The class is characterized by three natural properties: reward nonnegativity and boundedness, existence of a do-nothing action, and optimal action monotonicity. These properties are commonly present and typically easy to check. Implications of the class properties and of the variance bound are illustrated by examples of MDPs from operations research, operations management, financial engineering, and combinatorial optimization. Best regards, Dipartimento di Economia e Finanza Viale Romania, 32 - 00197 Roma economiaefinanza(a)luiss.it t +39 06 85225550 f +39 06 85225985

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Seminario Sergio Albeverio: Symmetries and stochastic differential equations (DipInf - UniVr)
by Luca di persio 23 Oct '15

23 Oct '15

Giovedi' 29 Ottobre, ore 16:30 (16:15 rinfresco, 16:30 inizio seminario) Presso: Dipartimento di Informatica (Sala Verde) Strada le Grazie, 15 https://goo.gl/maps/6mB9N2SSeqC2 Il prof. Sergio Albeverio (HCM - UniBonn) terrà il seguente seminario Title: Symmetries and stochastic differential equations. Abstract: Recently the study of relations between symmetries and stochastic (partial) differential equations has received renewed interest,in particular in relations with areas like hydrodynamics,finance and quantum field theory.The seminar will briefly present some of these developments. Speaker: Sergio Albeverio, HCM - University of Bonn __ Luca Di Persio - PhD assistant professor of Probability and Mathematical Finance Dept. Informatics University of Verona strada le Grazie 15 - 37134 Verona - Italy Dept. Math University of Trento V. Sommarive, 14 - 38123 Povo - Italy Tel : +39 0461 281686

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