Random

random@lists.dm.unipi.it

47 participants
5251 discussions

Mathematical Aspects of Quantum Information
by Sonia Mazzucchi 05 Apr '24

05 Apr '24

Buongiorno, vi inoltro l'annuncio di questo workshop. Buona giornata Sonia -------------------------------------------------------------------------------------------------- Dear all, we are glad to announce the workshop "*Mathematical Aspects of Quantum Information*", which will take place at *Politecnico di Torino *(Aula Buzano, DISMA) on *April 16-18, 2024*. This is the kick-off event of the GNAMPA INDAM Project 2024 "Tecniche analitiche e probabilistiche in informazione quantistica". We are pleased to host a minicourse by *Nilanjana Datta *(University of Cambridge), as well as invited lectures by: - *Marco Genovese *(INRIM) - *Davide Girolami *(Politecnico di Torino) - *Roberto Proietti *(Politecnico di Torino) - *Dario Trevisan *(University of Pisa) More details on the program can be found in the conference website: https://sites.google.com/view/mathqi24/. Registration is free of charge, but mandatory. Please circulate this message to potentially interested participants. Best regards, the organizing committee (Riccardo Adami - Ivan Gallo - Fabio Nicola - Federico Riccardi - S. Ivan Trapasso)

1 0

Seminars in Statistics - Varun Jog & Po-Ling Loh
by Pierpaolo De Blasi 05 Apr '24

05 Apr '24

SEMINARS IN STATISTICS @ COLLEGIO CARLO ALBERTO <https://www.carloalberto.org/events/category/seminars/seminars-in-statistic…> Venerdi 12 Aprile 2024, presso il Collegio Carlo Alberto, in Piazza Arbarello 8, Torino, si terranno i seguenti *2 seminari*: ------------------------------------------------ *11.00-12.00* Speaker: Varun Jog (University of Cambridge, UK) Title: *The sample complexity of simple binary hypothesis testing* Abstract: The sample complexity of simple binary hypothesis testing is the smallest number of i.i.d. samples required to distinguish between two distributions p and q such that the Type-I and Type-II errors are smaller than some pre-specified thresholds α and β, respectively. Our main contribution is deriving, under mild technical conditions, a formula for the sample complexity in terms of parameters p, q, alpha, and beta, that is tight up to universal multiplicative constants. ------------------------------------------------ *12.00-13.00* Speaker: Po-Ling Loh (University of Cambridge, UK) Title: *Differentially private M-estimation via noisy optimization* Abstract: We present a noisy composite gradient descent algorithm for differentially private statistical estimation in high dimensions. We begin by providing general rates of convergence for the parameter error of successive iterates under assumptions of local restricted strong convexity and local restricted smoothness. Our analysis is local, in that it ensures a linear rate of convergence when the initial iterate lies within a constant-radius region of the true parameter. At each iterate, multivariate Gaussian noise is added to the gradient in order to guarantee that the output satisfies Gaussian differential privacy. We then derive consequences of our theory for linear regression and mean estimation. Motivated by M-estimators used in robust statistics, we study loss functions which downweight the contribution of individual data points in such a way that the sensitivity of function gradients is guaranteed to be bounded, even without the usual assumption that our data lie in a bounded domain. We prove that the objective functions thus obtained indeed satisfy the restricted convexity and restricted smoothness conditions required for our general theory. We then show how the private estimators obtained by noisy composite gradient descent may be used to obtain differentially private confidence intervals for regression coefficients, by leveraging work in Lasso debiasing proposed in high-dimensional statistics. We complement our theoretical results with simulations that illustrate the favorable finite-sample performance of our methods. ------------------------------------------------ Sarà possibile seguire entrambi i seminari anche in streaming: Join Zoom Meeting <https://us02web.zoom.us/j/88987605028?pwd=YXN1akl1bkN3TEFlS3QrMWFDWEF5dz09> I seminari sono organizzati dalla "de Castro" Statistics Initiative www.carloalberto.org/stats -- Pierpaolo De Blasi University of Torino & Collegio Carlo Alberto carloalberto.org/pdeblasi <https://sites.google.com/a/carloalberto.org/pdeblasi/>

1 0

Seminario Padova - Stephan Eckstein
by alekos.cecchin＠unipd.it 04 Apr '24

04 Apr '24

Buongiorno, Il seminario di Stephan Eckstein di domani (titolo e abstract in basso) si potrà seguire anche su zoom: Argomento: Seminario Padova - Stephan Eckstein Ora: 5 apr 2024 02:30 PM Roma Entra Zoom Riunione https://unipd.zoom.us/j/86749461733 ID riunione: 867 4946 1733 Da: Alekos Cecchin via Random <random(a)lists.dm.unipi.it> Inviato: martedì 2 aprile 2024 21:38 A: random(a)mail.dm.unipi.it Oggetto: [Random] Seminario Padova - Stephan Eckstein Buongiorno a tutti, Vorremmo segnalarvi che venerdì prossimo (5 Aprile) alle ore 14:30 in aula 2AB40 (Torre Archimede, Università di Padova) ci sarà un seminario per il ciclo di seminari in Probabilità e Finanza di: Stephan Eckstein (Tübingen University) <https://sites.google.com/view/stephan-eckstein/startseite> https://sites.google.com/view/stephan-eckstein/ Title: Exponential convergence of Sinkhorn's algorithm and Hilbert's projective metric for unbounded functions Date: April 5, 2024, at 14:30, 2AB40 Abstract: Entropic regularization of optimal transport has found numerous applications in various fields recently. A major reason of this surge in applications is the popularization of Sinkhorn's algorithm to efficiently solve the entropic optimal transport problem numerically. The topic of this talk is the (rate of) convergence of Sinkhorn's algorithm. In bounded settings, it is known that Sinkhorn's algorithm converges with exponential rate, which is a consequence of applying a commonly used version of Hilbert's metric corresponding to the cone of all non-negative functions. This talk shows how to define versions of Hilbert's metric so that we can show exponential convergence of Sinkhorn's algorithm even in unbounded settings. This is done through the use of cones which are a relaxations of the cone of all non-negative functions, in the sense that they include all functions having non-negative integral values when multiplied with certain test functions. Along the way, we establish that kernel integral operators are contractions with respect to suitable versions of Hilberts metric, even if the kernel functions are not bounded away from zero. Vi aspettiamo numerosi! Alberto Chiarini e Alekos Cecchin Sito web del seminario: https://www.math.unipd.it/~chiarini/seminars/

1 0

PhD student positions in Stockholm
by mattisfra＠gmail.com 04 Apr '24

04 Apr '24

Dear all, The Department of Mathematics at Stockholm University is advertising two PhD student positions in mathematical statistics, with a wide range of topics in probability and statistics to choose from. The application deadline is April 23. More details, including information on available projects/supervisors, can be found in the advertisement: https://www.su.se/english/about-the-university/work-at-su/available-jobs/ph… Best regards, Matteo Sfragara (on behalf of Mia Deijen, mia(a)math.su.se)

1 0

Senior Tenure-Track Assistant Professor (RTDB) in Statistics, Ca’ Foscari University of Venice, Italy,Application Deadline: May 02, 2024 1:00pm (Italian Time)
by Carlo Gaetan 04 Apr '24

04 Apr '24

Dear all, I would like to draw to your attention the following academic position. *Senior Tenure-Track Assistant Professor (RTDB) in Statistics, Ca’ Foscari University of Venice, Italy Application Deadline: May 02, 2024 1:00pm (Italian Time) * The Department of Environmental Sciences, Informatics and Statistics of the Ca’ Foscari University of Venice is recruiting a full time Senior Tenure-Track Assistant Professor (RTDB) in Statistics (SECS-S/01 Statistica). The Department has been recognized as a "Department of Excellence" by the Italian Ministry of Education, University, and Research, securing special financial support for the 2023/2027 period. The new hire would join the Statistics group (https://www.unive.it/pag/41970/). The teaching load (which is reduced during the tenure track years) would include classes of varying size at bachelor, master and PhD level in Italian or English. Foreign candidates should state in their application that they have adequate Italian language skills or that they do not have adequate Italian language skills but they commit to achieve them. More information about the call (in Italian and English) can be found at https://www.unive.it/data/38002/?id=2024-UNVE000-0078551 Online application form https://apps.unive.it/domandeconcorso-en/accesso_cf/rtdb-2024secss01psr Ca’ Foscari University offers a start-up fund for newly recruited researchers and offers funding opportunities, including: - an annual support to individual researchers; - co-founded post-doc positions; - financial support for short-term incoming and outgoing visits; - financial support for seminars and visiting scholars. Professors and researchers who have carried out their research activities abroad for at least two consecutive years and who move to Italy acquiring tax residency, are entitled to substantial tax benefits. See more at https://www.agenziaentrate.gov.it/portale/web/english/nse/individuals/tax-i…. Informal enquiries about the job and the application process can be made to Professor Cristiano Varin cristiano.varin(a)unive.it Please share this information with anybody you think might be interested. Best regards, Carlo -- - Dipartimento di Scienze Ambientali, Informatica e Statistica - DAIS Università Ca' Foscari - Venezia Z.A12 - Edificio Zeta Via Torino, 155 I-30172 Mestre (VE) ITALY phone: ++39 041 234 8404 e-mail:[gaetan"at"unive"dot"it] web:[http://www.dais.unive.it/~gaetan] Please don't print this e-mail unless you really need to. Please avoid sending me Word, Excel or PowerPoint attachments. Seehttp://www.gnu.org/philosophy/no-word-attachments.html. Per favore non stampate questo messaggio se non è proprio necessario. Per favore non mandatemi allegati in Word, Excel o PowerPoint. Le ragioni sono spiegate quihttp://www.gnu.org/philosophy/no-word-attachments.it.html

1 0

Double Seminar: Federico Camia and Alessandra Bianchi at Tor Vergata 10.04
by Michele Salvi 04 Apr '24

04 Apr '24

Dear all, On Wednesday, April 10th, at 14h30 in Aula Dal Passo of Tor Vergata Math Department, RoMaDS (https://www.mat.uniroma2.it/~rds/events.php) will host a double seminar: 14h30 - Federico Camia (NYU Abu Dhabi) “Towards a logarithmic conformal field theory of 2D critical percolation” Abstract: Conformal field theory (CFT) provides a very powerful framework to study the large-scale properties of models of statistical mechanics at their critical point. The prototypical example of this is the continuum (scaling) limit of the two-dimensional critical Ising model. The case of critical percolation is more difficult, partly because its continuum limit is believed to be described by a relatively unusual type of CFT, called a logarithmic CFT. In this talk, I will first briefly explain the statements above. I will then present some recent results and work in progress that are part of a program aimed at fitting percolation within the logarithmic CFT framework. 15h30 - Alessandra Bianchi (Università di Padova) “Mixing cutoff for simple random walks on the Chung-Lu directed graph” Abstract: In this talk, we consider a simple random walk defined on a Chung-Lu directed graph, an inhomogeneous random network that extends the Erdos Renyi random digraph by including edges independently according to given Bernoulli laws. In this non-reversible setting, we will focus on the convergence toward the equilibrium of the dynamics. In particular, under the assumption that the average degree grows logarithmically in the size n of the graph (weakly dense regime), we will establish a cutoff phenomenon at the entropic time of order log(n)/loglog(n). We will then show that on a precise window the cutoff profile converges to the Gaussian tail function. This is qualitatively similar to what was proved in a series of works by Bordenave, Caputo, Salez for the directed configuration model, where degrees are deterministically fixed. In terms of statistical ensembles, this analysis provides an extension of these cutoff results from a hard to a soft-constrained model. Joint work with G. Passuello. We encourage in-person participation. Should you be unable to come, here is the link to the Teams streaming: https://teams.microsoft.com/l/meetup-join/19%3arfsL73KX-fw86y1YnXq2nk5VnZFw… https://teams.microsoft.com/l/meetup-join/19%3arfsL73KX-fw86y1YnXq2nk5VnZFw… https://teams.microsoft.com/l/meetup-join/19%3arfsL73KX-fw86y1YnXq2nk5VnZFw… The seminar is part of the Excellence Project MatMod@TOV.

1 0

open position
by Simone Padoan 04 Apr '24

04 Apr '24

Inoltro il seguente messaggio Applications are invited for a tenure-track professorship, starting at the beginning of the 2024-2025 academic year, within the Department of Mathematics at the University of Angers, France. The Mathematics department is looking for a candidate holding a PhD in mathematics whose research work is already widely recognized. The successful candidate's research will lie within the area of branching structures in probability theory. More specifically, his or her area of research should focus on branching structures such as discrete and continuous branching processes, spatial branching processes, random graphs, graph theory in combinatorics, fragmentation and coalescence, and/or applications in biology and particle physics. The appointed candidate will join the Analysis, Statistics and Probability team at the Laboratoire Angevin de Recherche en Mathématiques (LAREMA, UMR CNRS 6093) on September 1st, 2024. The initial three to five-year tenure-track contract offers very favorable conditions for research, with substantial support for travel, equipment and research support, as well as a competitive salary and a reduced teaching load. Courses will be taught in either French or English. In addition to teaching and research, the appointed candidate is expected to actively contribute to the scientific activities of the department, supervise (post)doctoral students, and raise external funding from the Agence Nationale de la Recherche (ANR), the ERC, or similar funding bodies. After the tenure-track period, this position is expected to lead to a permanent professorship corresponding to a "Professeur des Universités" position in the French Higher Education framework. Closing date for applications: 4pm (Paris) on April 30th, 2024. Applications should be submitted online via the link https://galaxie.enseignementsup-recherche.gouv.fr/antares/can/index.jsp (if this is your first visit to the website, please create an account by clicking on the link within the "Information" box just above the Login/Password fields). The link https://www.univ-angers.fr/_attachment/campagne-enseignants-chercheurs-2019… contains a detailed description of the position and a list of documents required to complete the application. For more details, feel free to contact the head of the search committee, Kilian Raschel, at Kilian.Raschel(a)math.cnrs.fr<mailto:Kilian.Raschel@math.cnrs.fr>.

1 0

Seminario Eliseo Luongo - Politecnico di Milano - 4 Aprile 2024
by Luca Scarpa 03 Apr '24

03 Apr '24

Si segnala il seguente seminario a tutti gli interessati. Giovedì 4 Aprile 2024, ore 11:30. Aula Seminari Mox - VI Piano, Dipartimento di Matematica, Politecnico di Milano. Speaker: Eliseo Luongo, Scuola Normale Superiore, Pisa. Title: Global Well-Posedness and Interior Regularity of 2D Navier-Stokes Equations with Stochastic Wind Driven Boundary Conditions. Abstract: Partial differential equations with boundary noise have been introduced by Da Prato and Zabczyck. They showed that, also in the one dimensional case, the solutions of the heat equation with white noise Dirichlet or Neumann Boundary conditions have low regularity compared to the case of noise diffused inside the domain. In particular, in the case of Dirichlet boundary conditions the solution is only a distribution. Some improvements in the analysis of the interior regularity of the solutions of these problems and some nonlinear variants have been obtained exploiting specific properties of the heat kernel and of suitable nonlinearities. All these issues make the problem of treating non-linear partial differential equations with boundary noise coming from fluid dynamical models an, almost untouched, field of open problems. In this talk we discuss the global well-posedness and the interior regularity of a system of 2D Navier-Stokes equations with inhomogeneous stochastic boundary conditions. The noise, white in time and coloured in space, can be interpreted as the physical law describing the driving mechanism on the atmosphere-ocean interface, i.e. as a balance of the shear stress of the ocean and the horizontal wind force. The talk is based on a joint work with A. Agresti. Link Zoom: https://polimi-it.zoom.us/j/98438435451?pwd=Q1F6eWpZVG1vMEhpMmp0aW4xMFJRUT09 Link Seminario Polimi: https://www.mate.polimi.it/eventi/?id=2400 ----- Luca Scarpa, PhD Associate Professor Department of Mathematics Politecnico di Milano Via E. Bonardi 9 20133 Milano, Italy e.mail: luca.scarpa(a)polimi.it url: https://sites.google.com/view/lucascarpa

1 0

Fwd: PhD vacancy on “Reliability of Dynamic Flow Networks” at TU/e
by Bernardo D'Auria 03 Apr '24

03 Apr '24

Buongiorno a tutti, Vi inoltro questo annuncio per una posizione di Ph.D. presso l'università tecnologica di Eindhoven. Un saluto Bernardo > Inizio messaggio inoltrato: > > Da: "Sloothaak, Fiona" <f.sloothaak(a)tue.nl> > Oggetto: PhD vacancy on “Reliability of Dynamic Flow Networks” at TU/e > Data: 2 aprile 2024 alle ore 16:27:45 CEST > A: "bernardo.dauria(a)unipd.it" <bernardo.dauria(a)unipd.it> > Cc: "Borst, Sem" <s.c.borst(a)TUE.nl> > > Dear Bernardo, > > Hope you are doing well. > > Reason that I am mailing you is to draw your attention to an open PhD position at the Stochastic Operations Research group at Eindhoven University of Technology. The topic is “Reliability of Dynamic Flow Networks”, for which we explore why major failures or congestion phenomena emerge in efficiently-operated flow networks (e.g. road networks or power grids), and how to prevents such adverse events. For more information, see https://jobs.tue.nl/nl/vacature/phdta-reliability-of-dynamic-flow-networks-…. > > In case you have a student that may be interested, please feel free to share the vacancy, or let the student contact us directly to discuss some more. > > Best wishes, > Fiona Sloothaak

1 0

Seminario Padova - Stephan Eckstein
by alekos.cecchin＠unipd.it 02 Apr '24

02 Apr '24

Buongiorno a tutti, Vorremmo segnalarvi che venerdì prossimo (5 Aprile) alle ore 14:30 in aula 2AB40 (Torre Archimede, Università di Padova) ci sarà un seminario per il ciclo di seminari in Probabilità e Finanza di: Stephan Eckstein (Tübingen University) <https://sites.google.com/view/stephan-eckstein/startseite> https://sites.google.com/view/stephan-eckstein/ Title: Exponential convergence of Sinkhorn's algorithm and Hilbert's projective metric for unbounded functions Date: April 5, 2024, at 14:30, 2AB40 Abstract: Entropic regularization of optimal transport has found numerous applications in various fields recently. A major reason of this surge in applications is the popularization of Sinkhorn's algorithm to efficiently solve the entropic optimal transport problem numerically. The topic of this talk is the (rate of) convergence of Sinkhorn's algorithm. In bounded settings, it is known that Sinkhorn's algorithm converges with exponential rate, which is a consequence of applying a commonly used version of Hilbert's metric corresponding to the cone of all non-negative functions. This talk shows how to define versions of Hilbert's metric so that we can show exponential convergence of Sinkhorn's algorithm even in unbounded settings. This is done through the use of cones which are a relaxations of the cone of all non-negative functions, in the sense that they include all functions having non-negative integral values when multiplied with certain test functions. Along the way, we establish that kernel integral operators are contractions with respect to suitable versions of Hilberts metric, even if the kernel functions are not bounded away from zero. Vi aspettiamo numerosi! Alberto Chiarini e Alekos Cecchin Sito web del seminario: https://www.math.unipd.it/~chiarini/seminars/

1 0

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

Random