семинар Алгебра и логика

На 7 януари 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. Доклад на тема: A valuation theorem for Noetherian rings ще изнесе Антони Рангачев (ИМИ - БАН). Резюме: A classical result due to Krull says that a normal domain R is equal to the intersection of the valuation rings in its field of fractions that contain R. If in addition R is Noetherian, then one can restrict the intersection to the discrete valuation rings that contain R. Now consider the following relative setting. Let A and B be integral domains. Suppose A is Noetherian and B is a finitely generated A-algebra that contains A. Denote by A' the integral closure of A in B. In [...]

На 21 януари 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. Доклад на тема: On the distribution of αp modulo one for primes p=aq^2+1 with prime q ще изнесе Татяна Тодорова (ФМИ-СУ). Резюме: It is a long-standing conjecture that there are infinitely many primes of the form n^2+1. Several approximations to this problem have been made. Baier and Zhao showed that for any ε > 0, there are infinitely many primes of the form p = aq^2 + 1, where a ≤ p^(5/9+ε). The best known result, due to Matomäki is that there are infinitely many primes of the form p = aq^2 + 1, where a ≤ p^(1/2+ε) and q is a prime. We [...]

На 28 януари 2022 г. (петък) от 13:00 ч. ще се проведе дистанционно заседание на семинара по „Алгебра и логика”. Доклад на тема: Bicommutative algebras from commutative point of view ще изнесе Веселин Дренски (ИМИ - БАН). Резюме: The nonassociative algebra R is right-commutative if (ab)c = (ac)b for all a, b, c in R, R is left-commutative if a(bc) = b(ac) for all a, b, c in R. Bicommutative algebras are algebras which are both left- and right-commutative. One-sided commutative algebras appeared for the first time in a paper by Cayley in 1857. Their important subclass of Gelfand-Dorfman-Novikov algebras were studied by Gelfand and Dorfman for the needs of the Hamiltonian operator in finite-dimensional mechanics and by Balinskii and Novikov in relation with [...]