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
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
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Meeting ID: 885 2101 5482
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.
 Yitang Zhang, Bounded gaps between primes, Annals of Mathematics, 179(2014), 1121-1174.
 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
10 September 2020, 17:30 - (UTC+3)
Organization: Mathematical colloquium in BMSTU