Banach

banach@mathdept.okstate.edu

2549 discussions

FW: Summer 2023: The Workshop in Analysis and Probably at Texas A&M University
by Bentuo Zheng (bzheng) 10 Feb '23

10 Feb '23

From: Barton, Cara M <cbarton(a)tamu.edu> Date: Friday, February 10, 2023 at 3:46 PM To: Barton, Cara M <cbarton(a)tamu.edu> Subject: Summer 2023: The Workshop in Analysis and Probably at Texas A&M University CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and trust the content is safe. Dear Colleagues, The Workshop in Analysis and Probably at Texas A&M University will be in session from July 5 to July 30, 2023. Summer 2023 Workshop in Analysis and Probability<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.math.…> This summer we will have two concentration weeks and SUMIRFAS 2023. All the events are scheduled to happen in person and we hope to see you all in College Station to learn new topics, start collaborating on new projects, and mingle! The first concentration week is on: Probability and Algebra: New Expressions<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.math.…> The second concentration week is on: Ideals and Algebras of Operators on Banach Spaces<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.math.…> It will be immediately followed by: SUMIRFAS 2023<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.math.…> The webpages for the various events will be continuously updated and shortly the speakers' lists are finalized, registration will formally open. If you have any questions about the Workshop in Analysis and Probably at Texas A&M University, feel free to reach out to Flo Baudier, Irina Holmes, or Bill Johnson. Best regards, Flo Baudier, and the co-organizers Irina Holmes and Bill Johnson.

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Bananch spaces webinar on Friday 2/10 by Dan Freeman (St Louis)
by Sari, Bunyamin 07 Feb '23

07 Feb '23

Hi all, We have a talk on this Friday Feb 10 at 9am (central US time) by Dan Freeman. Part 2 of the talk wiil be in the following week on Feb 17 by Mitchell Taylor. Zoom link https://unt.zoom.us/j/87400765190 Hope to see you then, Bunyamin https://researchseminars.org/talk/BanachWebinars/72/ Speaker: Daniel Freeman (St Louis University) Title: Stable phase retrieval in function spaces, Part I Abstract. Let $(\Omega,\Sigma,\mu)$ be a measure space, and $1\leq p\leq \infty$. A subspace $E\subseteq L_p(\mu)$ is said to do stable phase retrieval (SPR) if there exists a constant $C\geq 1$ such that for any $f,g\in E$ we have $$\inf_{|\lambda|=1} \|f-\lambda g\|\leq C\||f|-|g|\|.$$ In this case, if $|f|$ is known, then $f$ is uniquely determined up to an unavoidable global phase factor $\lambda$; moreover, the phase recovery map is $C$-Lipschitz. Phase retrieval appears in several applied circumstances, ranging from crystallography to quantum mechanics. We will discuss how problems in phase retrieval are naturally related to classical notions in the theory of Banach lattices. Through making this connection, we may apply established methods from the subject to attack problems in phase retrieval, and conversely we hope that the ideas and questions in phase retrieval will inspire a new avenue of research in the theory of Banach lattices. This talk is based on joint work with Benjamin Pineau, Timur Oikhberg, and Mitchell Taylor.

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BWB 2022 - registration and abstract submission
by Christina Brech 27 Jul '22

27 Jul '22

2nd ANNOUNCEMENT OF BWB 2022 Brazilian Workshop in Banach Spaces - Butantã edition December 5-9, 2022 Butantã Campus of the University of São Paulo, Brazil We would like to remind you that we are organizing the 2022 edition of the Brazilian Workshop in Banach Spaces. *Registration and abstract submission are now open and the deadline for the latter is August 31.* http://www.ime.usp.br/~banach/bwb2022/ The BWB will take place at the Butantã Campus of the University of São Paulo, in the city of São Paulo, in the week December 5-9, 2022. The scientific program will focus on the theory of geometry of Banach spaces, with emphasis on the following directions: Ramsey theory and set theory; homological theory, lattices and interpolation; operator theory and dynamics of operators; nonlinear theory on Banach spaces. Additional information can be found at the conference website <http://www.ime.usp.br/~banach/bwb2022/>. PROGRAM Tutorials: Piotr Koszmider (Polish Academy of Sciences) Étienne Matheron (Université d'Artois) Eva Pernecka (Czech T. U. in Prague) Noé De Rancourt (Charles University) Plenary speakers: Frédéric Bayart (U. Clermont Auvergne) Geraldo Botelho (U. F. Uberlândia) Bruno Braga (PUC Rio de Janeiro) Yolanda Moreno (U. Extremadura) Sofía Ortega Castillo (U. Guadalajara) Grzegorz Plebanek (Wroclaw U.) Pedro Tradacete (ICMAT - Madrid) Scientific committee Dana Bartosova (U. Florida) Christina Brech (U. São Paulo) Jesús Castillo (U. Extremadura) Valentin Ferenczi (U. São Paulo) Eloi Medina Galego (U. São Paulo) Sophie Grivaux (U. Lille) Jordi Lopez-Abad (UNED) Daniel Pellegrino (F. U. Paraíba) Michael Rincón (I. U. Santander) We are looking forward to meeting you this year in Brazil, Christina Brech, Alejandra Cáceres-Rigo, Leandro Candido, Willian Corrêa, Wilson Cuellar, Pedro Kaufmann, Victor S. Ronchim -- Christina Brech

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Banach spaces webinar on May 20 by Martin Doležal
by Sari, Bunyamin 19 May '22

19 May '22

Dear all, Please join us for the following talk on Friday, May 20 at 9AM (Central US time). Zoom link https://unt.zoom.us/j/83247072014 Speaker: Martin Doležal, The Czech Academy of Sciences Title: Descriptive complexity of Banach spaces. Abstract: We introduce a new natural coding of separable Banach spaces. The set of codes consists of (pseudo)norms on a certain vector space and is equipped with a canonical Polish topology. We use this coding to investigate the descriptive complexities of some classical Banach spaces. Among other results, we show that $\ell_2$ is a) the unique (up to isometry) separable Banach space with a closed isometry class, b) the unique (up to isomorphism) separable Banach space with an $F_\sigma$ isomorphism class. This is a joint work with Marek C\'uth, Michal Doucha and Ond\v rej Kurka.

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1st ANNOUNCEMENT OF BWB 2022
by Christina Brech 29 Apr '22

29 Apr '22

1st ANNOUNCEMENT OF BWB 2022 Brazilian Workshop in Banach Spaces - Butantã edition December 5-9, 2022 Butantã Campus of the University of São Paulo, Brazil We are glad to announce that we are organizing the 2022 edition of the Brazilian Workshop in Banach Spaces. This international conference will take place at the Butantã Campus of the University of São Paulo, in the city of São Paulo, in the week December 5-9, 2022. The scientific program will focus on the theory of geometry of Banach spaces, with emphasis on the following directions: Ramsey theory and set theory; homological theory, lattices and interpolation; operator theory and dynamics of operators; nonlinear theory on Banach spaces. The webpage of the workshop is under construction and is be available at http://www.ime.usp.br/~banach/bwb2022/ Registration will start mid 2022. Additional scientific and practical information will be given at that time. TENTATIVE PROGRAM Tutorials: Piotr Koszmider (Polish Academy of Sciences) Étienne Matheron (Université d'Artois) Eva Pernecka (Czech T. U. in Prague) Noé De Rancourt (Charles University) Plenary speakers: Frédéric Bayart (U. Clermont Auvergne) Geraldo Botelho (U. F. Uberlândia) Bruno Braga (U. Virginia & PUC Rio de Janeiro) Yolanda Moreno (U. Extremadura) Sofía Ortega Castillo (U. Guadalajara) Grzegorz Plebanek (Wroclaw U.) Pedro Tradacete (ICMAT - Madrid) Scientific committee Dana Bartosova (U. Florida) Christina Brech (U. São Paulo) Jesús Castillo (U. Extremadura) Valentin Ferenczi (U. São Paulo) Eloi Medina Galego (U. São Paulo) Sophie Grivaux (U. Lille) Jordi Lopez-Abad (UNED) Daniel Pellegrino (F. U. Paraíba) Michael Rincón (I. U. Santander & U. São Paulo) We are looking forward to meeting you this year in Brazil, Christina Brech, Alejandra Cáceres-Rigo, Leandro Candido, Willian Corrêa, Wilson Cuellar, Pedro Kaufmann, Victor S. Ronchim

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Banach spaces webinar on Friday 4/22 by Jarosław Swaczyna (Technical University of Łódź)
by Sari, Bunyamin 20 Apr '22

20 Apr '22

Hello, Please join us on Friday April 22 at 9AM (Central US time) for the following talk. Zoom link: https://unt.zoom.us/j/88007602660 Title: Continuity of coordinate functionals for filter Schauder basis Speaker: Jarosław Swaczyna (Technical University of Łódź) Abstract. Given a filter of subsets of natural numbers $F$ we say that a sequence $(x_n)$ is $F$-convergent to $x$ if for every $\varepsilon>0 $condition $\{n\in \N:d(x_n,x)<\varepsilon \}\in F$ holds. We may use this notion to generalize the idea of Schauder basis, namely we say that a sequence $(e_n)$ is an $F$-basis if for every $x\in X$ there exists a unique sequence of scalars $(\alpha_n)$ s.t. $\sum_{n,F} \alpha_n e_n=x$, which means that the sequence of partial sums is $F$-convergent to $x$. Once such a notion is introduced it is natural to ask whenever corresponding coordinate functionals are continuous. Such a question was posed by V. Kadets during the 4th conference Integration, Vector Measures, and Related Topics held in 2011 in Murcia. Surprisingly, there is an obstacle related to the lack of uniform boundedness of functionals related to $F$ basis, due to which we can not find proof of continuity analogous to the classical case. During my talk, I will discuss the problem and provide two proofs of continuity of considered functionals, which uses under some large cardinal assumptions. This is joint work with Tomasz Kania and Noe de Rancourt.

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Announcement of a Conference
by Bentuo Zheng (bzheng) 15 Apr '22

15 Apr '22

Dear Colleagues, Please find in the attachment the first official announcement of The International Online Conference “Current Trends in Abstract and Applied Analysis” which will be held (online) at Vasyl Stefanyk Precarpathian National University (Ivano-Frankivsk, Ukraine) on May 12-15, 2022. If you have any additional questions, please feel free to contact us by email cta(a)pnu.edu.ua<mailto:cta@pnu.edu.ua> or visit our website at https://conference.pu.if.ua/cta<https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fconferenc…> . We look forward to seeing you. On behalf of the organizers, with best regards, Andriy Zagorodnyuk Serhii Sharyn Roman Dmytryshyn

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Annoucement
by Bentuo Zheng (bzheng) 04 Apr '22

04 Apr '22

ANNOUNCEMENT Acta Scientiarum Mathematicarum (Acta Sci Math (Szeged) in short, web page: https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sprin… the 100th anniversary of its foundation this year (the founders were Frigyes Riesz and Alfréd Haar). On this occasion, a special double issue is to be published including invited papers by distinguished researchers on Functional Analysis and Operator Theory who once published in the journal. Besides that, a Zoom meeting is organized where experts in those areas will celebrate this remarkable anniversary, and talks by leading scholars (who all contribute to that special double issue) will be delivered. The dates of the meeting are May 5-6, 2022. The speakers are Joseph A Ball (Virginia Tech), Alain Connes (Collège de France and IHES), Fritz Gesztesy (Baylor U), Javad Mashreghi (U Laval), Mihai Putinar (UCSB), Dan-Virgil Voiculescu (UC Berkeley) Attendance at the meeting is free but subject to registration. The easy registration can be done through the page https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.math.u… where more details are (and will be) given. Lajos Molnar Editor-in-Chief

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Banach spaces webinar on Friday 3/4/22 by Mikhail Ostrovskii (St. John's)
by Sari, Bunyamin 28 Feb '22

28 Feb '22

Please join us on Friday March 4 at 9AM (Central US time) for the following talk. (Please note the zoom link different than before) Zoom link: https://unt.zoom.us/j/85738310731 Best regards, Bunyamin Sari Title: Dvoretzky-type theorem for locally finite subsets of a Hilbert space Speaker: Mikhail Ostrovskii (St. John's) Abstract. The main result of the talk: Given any $\varepsilon>0$, every locally finite subset of $\ell_2$ admits a $(1+\varepsilon)$-bilipschitz embedding into an arbitrary infinite-dimensional Banach space. The result is based on two results which are of independent interest: (1) A direct sum of two finite-dimensional Euclidean spaces contains a sub-sum of a controlled dimension which is $\varepsilon$-close to a direct sum with respect to a $1$- unconditional basis in a two-dimensional space. (2) For any finite-dimensional Banach space $Y$ and its direct sum $X$ with itself with respect to a $1$-unconditional basis in a two-dimensional space, there exists a $(1+\varepsilon)$-bilipschitz embedding of $Y$ into $X$ which on a small ball coincides with the identity map onto the first summand and on a complement of a large ball coincides with the identity map onto the second summand. (joint with F. Catrina and S. Ostrovska)

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Postdoctoral contracts Granada Univeristy
by Ginés López 25 Feb '22

25 Feb '22

The Institute of Mathematics of the University of Granada (IMAG) offers postdoctoral contracts around every mathematical area of research supported by the María de Maeztu Seal of Excellence. The deadline to appy is March 24th. The requirements and way to apply can be seen at banach(a)mathdept.okstate.edu The 4 contracts offered will have a duration of 2 years with a competitive salary in Spain (30.000-35.000 euros per year depending on thesis defense date). Thank you for spreading this news. Ginés López Granada University

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