The next meeting of the Algebra and Logic Seminar will be held on October 11, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on Bulgarian names in Antarctica: chronology, distribution, characteristics will be delivered by Lyubomir IVANOV. Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be held on September 13, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on ON COMMUTATOR KRYLOV TRANSITIVE AND COMMUTATOR WEAKLY TRANSITIVE ABELIAN p-GROUPS will be delivered by Peter DANCHEV. Everybody is invited. Abstract. The reported paper deals with a question, posed a few years ago by Laszlo Fuchs and other international experts in the contemporary theory of Abelian groups, having a special impact on the modern aspects of non-commutative ring theory. Specifically, the problem asks for the structural description of those Abelian p-groups whose endomorphisms are (additively) generated by commutators. In other words, all endomorphism are representable as a finite sum of products of commutators. [...]
The next meeting of the Algebra and Logic Seminar will be held on August 30, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on TYPE-THEORY OF ACYCLIC RECURSION AND ITS REDUCTION CALCULUS will be delivered by Rusanka LUKANOVA. Everybody is invited. Abstract. In this talk, I will introduce Moschovakis typed-theory of algorithms. I shall present its formal language and original reduction calculus, which reduces the terms to their canonical forms. Distinctively, the reduction calculus associates the formal theory with denotational and algorithmic semantics. The canonical forms determine the relation of algorithmic equivalence between terms. If time allows, I will extend the formal system by gamma-reduction and algorithmic gamma-equivalence. The gamma-calculus reduces the algorithmic complexity, by simplifying [...]
The next meeting of the Algebra and Logic Seminar will be held on June 28, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on The approach of intersecting null four-dimensional gravitational cones and a new theory of GPS intersatellite communications between moving satellites in the (near-Earth) gravitational field will be delivered by Bogdan G. Dimitrov (Instutute of Nuclear Research and Nuclear Energy at BAS and Institute of Advanced Physical Studies, New Bulgarian University). Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be held on June 14, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on Exact computation of eigenvalues and zero Jordan cells of singular completely nonnegative matrices will be delivered by Plamen Koev (San Jose State University California). Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be held on May 31, 2019 (Friday) at 12:30 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on ON THE DIFFERENCE OF KLOOSTERMAN SUMS OVER GF(p) will be delivered by Lyubomir BORISOV. Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be held on May 17, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on SOME CONGRUENCES ON THE ENDOMORPHISM MONOID OF A PARTICULAR DIGRAPH will be delivered by Laddawan LOHAPAN (Khon Kaen University, Khon Kaen, Thailand). Everybody is invited. Abstract. As normal subgroups in groups, congruences in Semigroup Theory play an important role. We consider the endomorphism monoid of the directed graph on the set of all natural numbers together with the so-called zig-zag order. The endomorphism monoid on a zig-zag order on $mathbb{N}$ can be regarded as the monoid $O_{mathbb{N}}$ of transformations preserving a zig-zag order. This monoid was first studied by Currie in 1991 [...]
The next meeting of the Algebra and Logic Seminar will be held on March 29, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on Weitzenböck derivations and conjecture of Nowicki will be delivered by Vesselin DRENSKY. Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be heldon March 15, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics.A talk onTransient Coalitions and Ordered Objectives in Infinite Games with Safety and Guarantee Objectiveswill be delivered by Dimitar GUELEV. Everybody is invited.
The next meeting of the Algebra and Logic Seminar will be held on February 22, 2019 (Friday) at 1:00 p.m. in Room 578 of the Institute of Mathematics and Informatics. A talk on NILPOTENT AND UNIPOTENT MATRICES OVER A FIELD WITH APPLICATIONS TO VON NEUMANN REGULAR RINGS AND FUNCTIONAL ANALYSIS will be delivered by Peter DANCHEV. Everybody is invited. Abstract Introduction: The question of whether or not the nilpotent square matrix is a linear combination of idempotent matrices is too long-standing and left-open yet. So, further results of this type would be of some interest and eventual importance. The goal of the present note is to promote such a kind of results with a possible application to the classical von Neumann regular rings and to the [...]
