## News

## Institute of Mathematics and Informatics announces a temporary postdoctoral position

The Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (IMI-BAS) announces a temporary postdoctoral position, funded by the Bulgarian Scientific Programme “*Enhancing the Research Capacity in Mathematical Sciences*” (PIKOM). The duration of the position is 12 months, extendable for up to 24 months under the programme. Starting date is September 1, 2023, the earliest, but is flexible. The working language is English or Bulgarian.

The following research topics are available, although excellent candidates with a strong track record are also invited to submit their own:

**Deep learning on networks****Stochastic processes, special functions, exponential functionals****Modelling of quality in service systems****Conceptual, informatical and mathematical models of socio-cyber-physical systems (SCPS)****Birational Geometry****Codes and designs in polynomials metric spaces****Discrete groups and their actions**

The approved researcher will be affiliated with the International Center for Mathematical Sciences – Sofia (ICMS-Sofia), which is part of the Institute of Mathematics and Informatics of the Bulgarian Academy of Sciences.

Interested candidates should provide a CV, list of publications, research statement and 1-3 letters of recommendation to pdj@math.bas.bg with a copy to vmil@math.bas.bg and director@math.bas.bg.

Find more on https://euraxess.ec.europa.eu/jobs/128918.

## Vesselin Dimitrov is the laureate of the 2023 IMI Mathematics Prize

The Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences is proud to announce Vesselin Dimitrov to be the laureate of the **IMI Mathematics Prize for the year 2023 for excellent achievements in Mathematics.**

He receives this recognition for his outstanding contributions to number theory and Diophantine geometry.

The IMI award for 2023 was presented to Dr. Vesselin Dimitrov on July 10, 2023, during the opening of the International Conference “Mathematics Days in Sofia 2023”. The prize was presented by Prof. Julian Revalski, President of the Bulgarian Academy of Sciences and Chairman of the Prize Committee, and was personally delivered by the President of the Republic of Bulgaria, Rumen Radev.

Vesselin Dimitrov was born in Sofia in 1986. He graduated from the National Gymnasium of Natural Sciences and Mathematics “Academician Lyubomir Chakalov”. In 2003, he was chosen to represent Bulgaria in the prestigious six-week summer school of the Massachusetts Institute of Technology – Research Science Institute (RSI). In 2005, he participated in the International Mathematics Olympiad, where he won a silver medal.

Dr. Dimitrov continued his education at Harvard University, where he received his bachelor’s degree in 2010 with a thesis under the supervision of Prof. Barry Mazur. He received his MA (2014) and PhD (2017) from Yale University. His academic supervisor was Prof. Alexander Goncharov. Dr. Dimitrov is currently a member of the Institute of Advanced Study at Princeton and an associate professor at the Georgia Institute of Technology, USA. In 2022 Dr. Dimitrov was awarded the Oberwolfach Prize for “his outstanding contribution to number theory and Diophantine geometry” and with the David Gross Prize (which he shared with Ziyang Gao).

Vesselin Dimitrov works in the field of number theory, Diophantine geometry, and related problems from algebraic geometry, representation theory and harmonic analysis. He proved two famous and very difficult conjectures from the 1970s: The Schinzel-Zassenhaus conjecture for algebraic units close to the unit circle and the “unbounded denominators” conjecture, which concerns incongruent modular forms and which he proved together with Yunqing Tang and Frank Calageri. Another significant contribution of Vesselin Dimitrov, Ziyang Gao and Philipp Habegger is the proof of a uniform bound for the number of rational points of a curve X of genus g>1, which depends only on g and the rank of the Mordell-Weil group of the Jacobian of X.

**About the Prize**

For the first time, the Prize was awarded in 2014 to Martin Kassabov, a Professor at the University of Cornell, USA. In 2017, during the International Conference Mathematics Days in Sofia, the prestigious award was presented to Kiril Dachev, professor of mathematics at Purdue University, USA. The first woman recipient of the IMI Award is Greta Panova, associate professor at the University of Southern California, USA, who received the award in 2020. More about the laureates read here.

The IMI award is a metal statuette, accompanied by a diploma and a cash prize. Funds for the premium are raised through donations. Details about the Prize and the nominations procedure can be found in the Statute of the Prize.

## The International Conference Mathematics Days in Sofia welcomes more than 200 mathematicians from all over the world

From July 10 to 14, 2023, the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences, together with the Faculty of Mathematics and Informatics of the Sofia University “St. Kliment Ohridski” and the Union of Bulgarian Mathematicians, will hold the **International Conference Mathematics Days in Sofia – MDS2023**. More than 200 scientists from 30 countries arrived in Sofia for the traditional meeting of Bulgarian mathematicians.

The official opening of the International Conference will be held on July 10, 2023, at 9:30 a.m. in the Vasil Levski Hall of the Hyatt Regency Sofia Hotel. Among the invited official guests are the Minister of Education and Science, Prof. Galin Tsokov, the President of the Bulgarian Academy of Sciences, Prof. Julian Revalski, the Rector of Sofia University, Prof. Anastas Gerdzhikov, the Mayor of Sofia, Mrs Yordanka Fandakova, representatives of business and of the academic community across the country.

During the opening, the** IMI Mathematics Prize for 2023** will be presented. The Prize is awarded every three years to a Bulgarian mathematician under the age of 40 for high achievements in the field of mathematics. The award will be presented by Prof. Julian Revalski, Chairman of the Award Committee, and will be delivered in person by the President of the Republic of Bulgaria. IMI Mathematics Prize was founded in 2014 and its laureates are Martin Kassabov, Cornell University in Ithaca, USA (2014), Kiril Dachev, Purdue University, USA (2017), and Greta Panova, University of Southern California, USA (2020). You can find more about the laureates here.

It’s a well-known fact that many Bulgarian mathematicians and computer scientists work in prestigious universities and scientific centres outside Bulgaria. One of the main goals in organizing and holding scientific forums such as Mathematics Days in Sofia is to strengthen and deepen the ties with the Bulgarian mathematical diaspora by providing an environment for successful joint research activities and to continue fostering a strong, globally connected Bulgarian mathematical community.

The presidential institution of the Republic of Bulgaria traditionally demonstrates a deep interest in the development of mathematics and informatics in Bulgaria and works hard to maintain its high level and positive image in front of society – that is why the conference is held under the patronage of the President of the Republic of Bulgaria, Mr Rumen Radev.

Mathematics Days in Sofia is being held with the support of the Scientific Program Enhancing the Research Capacity In Mathematical Sciences (PIKOM), implemented jointly with the Ministry of Education and Science, and the Simons Foundation.

Detailed information about the conference can be found on the MDS2023 website.

The rich program of MDS2023 is divided into seven thematic sections, including two workshops and five mini-symposia. See the program of the event by day here.

## Prof. Michael R. Douglas will visit the International Center for Mathematical Sciences in Sofia

*The famous scientist **will give lectures at the Bulgarian Academy of Sciences.*

On June 30, 2023, Prof. Michael R. Douglas from Harvard University, CMSA will deliver two lectures in the “Marin Drinov” Hall of the Bulgarian Academy of Sciences. Prof. Douglas is visiting the International Center for Mathematical Sciences (ICMS–Sofia) and giving lectures in the *Consortium Distinguished Lecture Series*, a joint initiative of the ICMS–Sofia and the Institute of the Mathematical Sciences of the Americas (IMSA) at the University of Miami. This lecture series aims to highlight outstanding recent achievements in Mathematics. The distinguished speakers up to now have been: Don Zagier, Ramanujan International Chair, International Center for Theoretical Physics; Karim Adiprasito, Department of Mathematical Sciences, University of Copenhagen, Denmark; Dennis Gaitsgory, Harvard University; Sergei Gukov, California Institute of Technology; Edward Saff, Vanderbilt University, USA; Maria J. Esteban, Center National de la Recherche Scientifique, Paris, France; Ernesto Lupercio, Cinvestav, Mexico; and Andrés Navas, Universidad de Santiago de Chile.

Michael R. Douglas received his PhD in Physics in 1988 under the supervision of John Schwarz, one of the developers and leading researchers in superstring theory. Douglas is best known for his work in string theory, for the development of matrix models (the first nonperturbative formulations of string theory), for his work on Dirichlet branes and on noncommutative geometry in string theory, and for the development of the statistical approach to string phenomenology. He has influenced the developments of modern mathematics by finding interpretations of branes on the language of derived categories and introducing the theory of stability conditions for categories.

Michael R. Douglas received the 2000 Sackler Prize in theoretical physics and has been a Gordon Moore Visiting Scholar at Caltech, a Louis Michel Visiting Professor at the IHES, and a Clay Mathematics Institute Mathematical Emissary. He was the first permanent professor in the Simons Center for Geometry and Physics. Douglas is a fellow of the American Mathematical Society and a member of the American Physical Society, and has served as the editor of the Journal of High Energy Physics and of Communications in Mathematical Physics.

## Prof. Bernard Teissier is visiting the International Center for Mathematical Sciences – Sofia

Prof. Bernard Teissier, Institute Mathématique de Jussieu-Paris Rive Gauche, is visiting the International Center for Mathematical Sciences – Sofia and will deliver a lecture on “Objectivity and Subjectivity in Mathematics” next week.

Prof. Bernard Teissier is a world-renowned mathematician who works in the field of algebraic geometry, singularity theory and commutative algebra. On June 8, 2023, Thursday, from 5:00 p.m. in the “Prof. Marin Drinov” hall of the Bulgarian Academy of Sciences he will give a talk on “Objectivity and Subjectivity in Mathematics”. The event takes place within the framework of the BAS Academic Seminar.

Prof. Teissier is a guest of the program “Increasing research capacity in the field of mathematical sciences” (PIKOM) of the Institute of Mathematics and Informatics at the Bulgarian Academy of Sciences (IMI–BAS) and the International Center for Mathematical Sciences – Sofia (ICMS-Sofia). During his visit, he will work with colleagues from IMI-BAS on Lipshitz geometry of singularities of complex-analytic curves.

In 1967, Bernard Teissier graduated from the Ecole Polytechnique in Paris and the same year he decided to devote himself to mathematics after accidentally attended lectures by Oskar Zariski, one of the fathers of modern algebraic geometry, who later became his mentor. In 1968 Teissier became a PhD student of Heiske Hironaka – author of the theorem for resolution of singularities for which proof Hironaka was awarded the Fields Medal.

In the 1970s, Teissier was a visiting professor at Harvard University. After his return to France he fell under the influence of the famous French mathematician René Thom (Fields Medalist, 1958), who is one of the founders of singularity theory. In 1979, it became Directeur de recherche at the National Center for Scientific Research in France (CNRS). From 1987 to 1999, Teissier was a professor at the École normale supérieure in Paris (ENS). Since 2000, he has been associated with the Mathematical Institute Institute Mathématique de Jussieu-Paris Rive Gauche.

*Abstract:*

*In the first part of the talk, I shall explore the consequences of distinguishing the foundations of meaning and the foundations of truth in mathematical statements, or imagination and rigor as motors of mathematical development. The foundations of meaning can be sought in our largely unconscious perception of the world, which modern cognitive science is exploring. *

*In the second part, I shall illustrate this by comparing two approaches to understanding mathematical problems: creating appropriate abstract structures, which is exemplified by Galois, Hilbert, Bourbaki and Grothendieck, or creating geometric models where we can use our intuition of space, of which Riemann, Poincaré and Thom were masters. This part requires some basic mathematical knowledge.*

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