Семинар

[Margarita Nikolova]

Здравейте,

На 5 януари 2026 г. (понеделник) от 14:15 ч. в аудитория 501 на ФМИ ще се проведе сбирка на Семинара по оптимизация.

Докладчик: Cheng-Han Pan, Department of Mathematics and Statistics, Mount Holyoke College, South Hadley, Massachusetts, United States

Тема: Differentiable Monsters and Set of Monstrous Shift

Резюме: “Monsters! An outrage against common sense. An arrogant distraction,and of little use to the subject.” In this talk, we begin with a few historical remarks on the well-known Weierstrass monster and then breed a differentiable monster that is at once “rugged” and “smooth.” In particular, given a strictly increasing differentiable function f : R → R whose derivative vanishes on a dense subset of R, Ciesielski showed that there is at least a comeager amount of t ∈ R such that f(x) − f(x − t) is nowhere-monotone. Moreover, we show that the set of shifts for which the difference is nowhere monotone is not only comeager but also has full Lebesgue measure in R. Interestingly, we also provide a specific pair of strictly increasing differentiable functions φ, ψ: R → R such that φ(x)−ψ(x−t) is nowhere-monotone for every t ∈ R.

Библиография:

[1] Krzysztof Chris Ciesielski, Monsters in calculus, Amer. Math. Monthly 125 (2018), no. 8, 739–744, DOI 10.1080/00029890.2018.1502011. MR3859646 

[2] Adam Kucharski, Math’s Beautiful Monsters, Nautilus Quarterly (2014). https://nautil.us/maths-beautiful-monsters-234859/

[3] Cheng-Han Pan, Nowhere-monotone differentiable functions and set of monstrous shift, J. Math. Anal. Appl. 525 (2023), no. 2, Paper No. 127176, DOI 10.1016/j.jmaa.2023.127176. MR4559372

Каним всички интересуващи се!

С пожелание за светли коледни празници и щастлива и успешна нова година,

Маргарита и Стоян

[Nadejda Ribarska]

За много години, колеги!

Исках само да напомня, че утре имаме семинар :)

Бъдете здрави,

Надя

---

From: "margarita nn" <margar...@abv.bg>
To: "op fmi" <op_...@googlegroups.com>
Sent: Tuesday, December 23, 2025 9:07:45 PM
Subject: Семинар

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[Nadejda Ribarska]

Здравейте, колеги!

Копирам отдолу обявите за две конференции, които получих.

С най-хубави пожелания,

Надя

______________________________________________________________________________

Dear colleague:

This is the announcement of the conference Workshop on Geometric and Functional Analysis which will be held in Madrid (Spain) on March 18-20, 2026. The registration is now open in Registration – Workshop on Geometric and Functional Analysis  and the deadline is March 13th, 2026.

Our web page at Workshop on Geometric and Functional Analysis contains detailed information about the conference, including:  registration and payment, abstract submission for short talks and venue.

Main speakers are: Zoltán Buczolich, Aris Daniilidis, Bruce Hanson,Toni Ikonen, María Ángeles Japón, Tapio Rajala, Abraham Rueda Zoca, Miguel Ángel Ruiz Risueño and Sebastián Tapia-García, 

In addition, participants will have the opportunity to deliver a short talk.

Please do not hesitate in contacting us at worksho...@ucm.es if you need further information.

Looking forward to meeting you in Madrid!

The organizers,

M. García-Bravo, J. A. Jaramillo, M. Jiménez-Sevilla, S.Lajara, J. Llorente.

--

Jesús Llorente Jorge

Profesor Ayudante Doctor (Assistant Professor).
Departamento de Análisis Matemático y Matemática Aplicada.
Facultad de Ciencias Matemáticas.
Universidad Complutense de Madrid.

Plaza de las Ciencias 3.

28040 - Madrid (Spain).

Email: jesl...@ucm.es
Phone#: (+34) 913944941

___________________________________________________________________________________________________

Dear Colleague,

I hope this message finds you well. 

I am reaching out to inform you that Luis Carlos García Lirola (Zaragoza University) and I are organizing the Summer School "Topics in Banach Space Theory", scheduled to take place from July 6 to July 10, 2026, at CIEM in Castro Urdiales, Spain.

The program will consist of a series of mini-courses and talks delivered by both junior and senior researchers, as well as free time aimed at fostering open discussions and collaboration among participants. The core minicourses will be given by:

• Christina Brech (São Paulo University, Brazil): Combinatorics in nonseparable Banach spaces. 
• Marek Cúth (Charles University, Czech Republic): Descriptive set theory in Banach spaces. 
• María Japón (Seville University, Spain): Metric fixed point theory with applications.
• Mikhail Ostrovskii (St. John's University, USA): Finite-dimensional transportation cost spaces. 

Given our limited budget, we would appreciate it if you could let us know whether you might be interested in attending the School. To do so, please fill out the following form: https://forms.gle/fi2Wvq4LHLksNVUY8.

The School is supported by the Centro Internacional de Encuentros Matemáticos of the University of Cantabria, the European Mathematical Society, and the Instituto Universitario de Matemáticas y Aplicaciones and the Department of Mathematics of the University of Zaragoza. 

Further information on the program, including the website for formal registration, will be made available at: https://banach26.unizar.es/.

Thank you for your attention.

Best regards,

Sheldon Gil Dantas and Luis C. García-Lirola