21 September 2020, 18:30 - (UTC+3)

Title : Mathematics with a taste of Combinatorics on Words FOURTH PART: MATHEMATICAL LOGIC

Speaker : Mehdi Golafshan

Organization : Knots and representation theory

Abstract:

First, we will review the concepts of first-order logic. Then we will talk about Logical characterization of words. Topics such as Presburger's theorem, Buchi's theorem and Characterization of k-automatic sequences. The application of the subject appears in the Thue-Morse word.

This talk will be given by zoom

Join Zoom Meeting

https://us02web.zoom.us/j/88521015482?pwd=dHBNdFBMVjEyMTNiYnpLZXBGUUZYdz09

Meeting ID: 885 2101 5482

Passcode: 141592

23 September 2020, 10:30 - (UTC+3)

Title: On distribution of primes and divisor functions in arithmetic progressions

Speaker : Fei Wei (YMSC)

Organization : Seminar in Moscow and Beijing by zoom

Abstract : In this talk, we first give a brief introduction to Zhang's work on bounded gaps between primes. He showed that there are infinitely many pairs of primes such that their difference is bounded by a positive constant. Then we introduce the joint work with Zhang and Xue on general divisor functions in arithmetic progressions.

[1] Yitang Zhang, Bounded gaps between primes, Annals of Mathematics, 179(2014), 1121-1174.

[2] Fei Wei, Boqing Xue and Yitang Zhang, General divisor functions in arithmetic progressions to large moduli, Science China Mathematics, vol. 59, issue 9, pp. 1663-1668

The seminar will be held during 15:30--17:00 (Beijing time) on Zoom.

Meeting ID: 831 5020 0580

Password: 141592

10 September 2020, 17:30 - (UTC+3)

Title:

Speaker:

Organization: Mathematical colloquium in BMSTU

Abstract: