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Seminario tra Geometria e Probabilita' di Daniele Agostini a Roma Tre il 29-10-2018
by Pietro Caputo 23 Oct '18

23 Oct '18

Daniele Agostini (Max-Plank Institute fur Mathematik, Leipzig) Titolo: Discrete Gaussians, theta functions and abelian varieties Lunedi' 29 Ottobre 2018 ORE 14:30 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C - Aula 009 Abstract The Gaussian distribution is a central object in mathematics and it can be characterised as the unique probability on the real numbers that maximises entropy, for fixed mean and variance. It turns out that the same property can be used to define a discrete Gaussian distribution on the integers. Moreover, the discrete Gaussian is parametrised naturally by the Riemann theta function, and, as such, it has a natural connection to the theory of abelian varieties in algebraic geometry. The aim of the talk is to present this connection and to show how question in probability give rise to natural problems in algebraic geometry and viceversa. This is joint work with Carlos Amendola (TU Munich).

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Workshop in Financial Mathematics in Padova
by Giorgia Callegaro 22 Oct '18

22 Oct '18

Dear colleagues, we are pleased to announce that the (mini) “Workshop in Financial Mathematics” will be held the 12 November 2018 at the Department of Mathematics of the University of Padova. The Workshop will start at 2.30 pm (in “Sala Riunioni” VII floor, stairs B) and it will finish at 6pm. The list of invited speakers is available at the conference website: https://events.math.unipd.it/WFM2018/node/1 There is no registration fee, but all participants are kindly requested to register to the Workshop via the online form available here: https://events.math.unipd.it/WFM2018/node/27 See you in Padova! The organising committee Giorgia Callegaro Martino Grasselli Wolfgang Runggaldier Tiziano Vargiolu -- 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 <https://webmail.math.unipd.it/horde3/imp/message.php?mailbox=Sent&index=598#> Personal web-page: https://sites.google.com/site/giogiocallegaro/Home

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(senza oggetto)
by Massimo Campanino 22 Oct '18

22 Oct '18

Il giorno giovedì 15 novembre alle ore 16 nell'aula Seminario 2 del Dipartimento di Matematica dell'Università di Bologna (pazza Porta S. Donato 2) il dott. Gianluca Bosi dell'Università di Bologna terrà un seminario dal titolo Revolving random walks in 2D: analysis of type and winding number. We consider simple random walks on two directed versions of the $\mathbb{Z}^2$ lattice; one characteristic feature of these random walks is that they are bound to revolve, according to the orientation prescribed by the edges. The first model was studied by Campanino and Petritis(‘03) and shown to be transient; the other one appeared recently in a paper by Menshikov et al. (’17), where the authors conjectured its recurrence. We shall indeed confirm this conjecture: our proof is done by considering a continuous analogue of the random walk and then applying the Lyapunov function criteria. On the other hand, we obtain a local limit theorem for the return probabilities of the first random walk, which in particular gives a new proof of transience. Finally, we deduce some results related to the winding number for both random walks. This results are joint work with Y.Peres (Microsoft Research, Redmond) and Y.Hu (University of Washington).

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Fwd: RS&A2019
by Gustavo Posta 22 Oct '18

22 Oct '18

Begin forwarded message: > From: The 19th International Conference on Random Structures and Algorithms <rsa2019(a)amu.edu.pl> > Date: 22 ottobre 2018 13.51.37 GMT+02.00 > To: ukryci-adresaci: ; > Subject: RS&A2019 > > > > The 19th International Conference on > RANDOM STRUCTURES AND ALGORITHMS > Zurich, 15-19 July, 2019 > > > We are pleased to announce that the 19th International Conference on Random Structures and Algorithms "RS&A2019" will be held at the ETH in Zurich, 15-19 July, 2019. > > The list of invited speakers is available at the conference website: https://www.math.ethz.ch/fim/conferences/19th-int-conf-random-structures-al…; > the registration is already open: https://www.math.ethz.ch/fim/conferences/19th-int-conf-random-structures-al…. > > We have some limited funding (in terms of accommodation and a per diem) available for graduate students or postdocs. The application form can be found under the link: https://www.math.ethz.ch/fim/conferences/19th-int-conf-random-structures-al… > > More information will be available soon. > > With best regards, > The organizers > > © 2018 - RSA2019 >

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Assegno di ricerca, Università Milano-Bicocca
by andrea ongaro 22 Oct '18

22 Oct '18

Si informa che presso il Dipartimento di Economia, Metodi Quantitativi e Strategie d’Impresa dell’Università Milano-Bicocca è stato bandito un assegno di ricerca (tipo A1, Junior) della durata di 24 mesi rinnovabili sul tema: “Modelli non standard per dati ad elevata complessità”. SCADENZA: 6 novembre 2018. BANDO: https://www.unimib.it/ateneo/gare-e-concorsi/assegni-ricerca-tipo-a1-a1-typ… Cordialmente Andrea Ongaro

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Seminario BELITSER
by Matteo Ruggiero 22 Oct '18

22 Oct '18

STATISTICS SEMINARS @ COLLEGIO CARLO ALBERTO Venerdì 26 Ottobre 2018, alle ore 12:00, presso il nuovo edificio del Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terrà il seguente seminario: ------------------------------------------------ Eduard BELITSER (Vrije Universiteit Amsterdam) ROBUST INFERENCE FOR GENERAL PROJECTION STRUCTURES BY EMPIRICAL BAYES AND PENALIZATION METHODS We develop a general framework of projection structures and study the problem of inference on the unknown parameter within this framework by using empirical Bayes and penalization methods. The main inference problem is the uncertainty quantification, but on the way we solve the estimation and posterior contraction problems as well (also a weak version of structure recovery problem). The approach is local in that the quality of the inference procedures is measured by the local quantity, the oracle rate, which is the best trade-off between the approximation error by a projection structure and the complexity of that approximating projection structure. The approach is also robust in that the stochastic part of the general framework is assumed to satisfy only certain mild condition, the errors may be non-iid with unknown distribution. We introduce the excessive bias restriction (EBR) under which we establish the local (oracle) confidence optimality of the constructed confidence ball. As the proposed general framework unifies a very broad class of high-dimensional models interesting and important on their own right, the obtained general results deliver a whole avenue of results (many new ones and some known in the literature) for particular models and structures as consequences, including white noise model and density estimation with smoothness structure, linear regression and dictionary learning with sparsity structures, biclustering and stochastic block models with clustering structure, covariance matrix estimation with banding and sparsity structures, and many others. Many adaptive minimax results over various scales follow from our local results. (Joint work with N. Nurushev.) ------------------------------------------------ Tutti gli interessati sono invitati a partecipare. Il seminario è organizzato dalla "de Castro" Statistics Initiative (www.carloalberto.org/stats) in collaborazione con il Collegio Carlo Alberto. Cordiali saluti, Matteo Ruggiero --- Matteo Ruggiero University of Torino and Collegio Carlo Alberto www.matteoruggiero.it

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seminar announcement
by Marco Scarsini 19 Oct '18

19 Oct '18

October 25th, 2018 12:00 Room 207 *Department of Economics and Finance* LUISS Viale Romania 32 00196 Roma *Speaker:* Bernhard von Stengel / London School of Economics *Title: * *“Equilibria in the challenge tournament”* *Abstract:* *“Arad and Rubinstein (2013) describe a challenge tournament where n players have a binary choice and play a round-robin tournament where they score against each other randomly for a stake that depends on their choices. The player with the highest total score wins, with ties resolved randomly. They conjecture that for n > 3 the only equilibrium is that all players take the riskier choice. We present work in progress on an elementary proof of this conjecture which is based on a simple dominance argument.”* The calendar of the future seminars can be found at http://economiaefinanza.luiss.it/en/seminari/prossimi-seminari ******************************************************* Marco Scarsini Dipartimento di Economia e Finanza LUISS Viale Romania 32 00197 Roma, ITALY URL: http://docenti.luiss.it/scarsini/

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Winter Workshop on Complex Systems 2019 in Zakopane
by Mateusz Wilinski 18 Oct '18

18 Oct '18

Dear All, next year the Winter Workshop on Complex Systems will be held in Zakopane (Poland) from 4th to 8th February 2019. The event is tailored for PhD students and young scientists working in the broad area of Complex Systems (including problems from Biology, Physics, Finance and Economy, Machine Learning and many more). The call for participation in the 2019 edition is now open and the application deadline is 31st of October. All the details are available at: http://wwcs2019.org The cost of the workshop is just 100 euros, which includes accommodation, food, transport from Cracow, social events and more. Participants will also have the chance to interact and hear lectures from exciting scientist, namely: Fabrizio Lillo, Chiara Poletto, Pere Colet and Piotr Fronczak. I hope to see applications from many of you. :) We would also be really happy, if you could help to spread the information and encourage others to apply. Best wishes, on behalf of the organizing committee Mateusz Wilinski

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Bootstrap percolation: subcritical universality class and oriented percolation - Seminario di Ivailo Hartarsky il 24/10/18 a Roma Tre
by Pietro Caputo 16 Oct '18

16 Oct '18

Ivailo Hartarsky (ENS, France) Titolo: Bootstrap percolation : subcritical universality class and oriented percolation Mercoledi' 24 Ottobre 2018 ORE 16:00 Dipartimento di Matematica e Fisica Universita' degli Studi Roma Tre Largo San Leonardo Murialdo,1 - Pal.C - Aula 211 Abstract Bootstrap percolation is a wide class of deterministic monotone cellular automata with random initial state closely related to several other statistical physics models such as the kinetically constrained spin models for the spin glass transition. There are three `universality classes' of bootstrap percolation in two dimensions. Of them the `subcritical' ones those exhibiting a non-trivial phase transition are by far the most poorly understood. In this work we develop a first approach for studying them. We will start with a gentle introduction to the field and its universality picture to provide the necessary background. We will then introduce the main new notion of critical density and state our main result. We will then illustrate the method by applications to concrete examples yielding new and old results in the area. The approach establishes and exploits a tight connection with a new generalization of classical oriented percolation, whose further study will have a direct impact on bootstrap percolation. The talk will be based on the preprint arxiv:1806.11405.

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Assegno di ricerca presso Politecnico di Milano
by Alessandra Menafoglio 16 Oct '18

16 Oct '18

Il Dipartimento di Matematica del Politecnico di Milano ha bandito un assegno di ricerca di 12 mesi descritto in dettaglio al link https://www.polimi.it/index.php?id=3971 <https://www.polimi.it/index.php?id=3971&tx_wfqbe_pi1%5bID%5d=7923> &tx_wfqbe_pi1%5bID%5d=7923 sul tema Modellazione statistica e numerica di trasporto di sedimenti in bacini montani nell'ambito della partecipazione del laboratorio MOX al progetto della Fondazione CARIPLO SMART-SED. Eventuali interessati possono contattare <mailto:luca.bonaventura@polimi.it> luca.bonaventura(a)polimi.it <mailto:alessandra.menafoglio@polimi.it> alessandra.menafoglio(a)polimi.it per maggiori informazioni. La scadenza del bando è il 25 ottobre 2018 e la prevista data per la presa di servizio il primo dicembre 2018. Grazie in anticipo per la diffusione a tutti i potenziali interessati. Alessandra Menafoglio -- Alessandra Menafoglio MOX - Dept. of Mathematics Politecnico di Milano Piazza Leonardo da Vinci, 32, 20133, Milan Italy Phone: +39 02 2399 4642 Email: <mailto:alessandra.menafoglio@polimi.it> alessandra.menafoglio(a)polimi.it

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