Komarnytskyi Scientific Seminar
at Algebra & Logic and Geometry & Topology Departments of
Ivan Franko National University of Lviv
Archive for (2019/2020) academic year



S-acts Theory and
Spectral Spaces

September 16, 2019 I. Pozdniakova
  • Inverse monoids of partial graph automorphisms, II

    We discuss on the results of the paper Robert Jajcay, Tatiana Jajcayova, Nóra Szakács, Mária B. Szendrei, Inverse monoids of partial graph automorphisms, arXiv:1809.04422.

September 25, 2019 I. Pozdniakova
  • Inverse monoids of partial graph automorphisms, III

    We discuss on the results of the paper Robert Jajcay, Tatiana Jajcayova, Nóra Szakács, Mária B. Szendrei, Inverse monoids of partial graph automorphisms, arXiv:1809.04422.

November 6, 2019 O. Lysetska
  • Structure theory of regular semigroups

    We discuss on the survey paper Mária B. Szendrei, Structure theory of regular semigroups, arXiv:1909.05280.

November 13, 2019 O. Lysetska
  • Structure theory of regular semigroups, II

    We discuss on the survey paper Mária B. Szendrei, Structure theory of regular semigroups, arXiv:1909.05280.

November 20, 2019 O. Lysetska
  • Structure theory of regular semigroups, III

    We discuss on the survey paper Mária B. Szendrei, Structure theory of regular semigroups, arXiv:1909.05280.

January 22, 2020 O. Gutik and
A. Savchuk
  • On homomorphic retracts of the momoid $\mathbf{I}\mathbb{N}_{\infty}$

    We discuss on homomorphic retracts of the momoid $\mathbf{I}\mathbb{N}_{\infty}$ of co-finite partial isometries of the set of positive integers $\mathbb{N}$. In particular, we construct a class homomorphic retracts of $\mathbf{I}\mathbb{N}_{\infty}$, which elements contains the submonoid $\mathcal{C}_{\mathbb{N}}$, generated by shifts of $\mathbb{N}$, such that $\mathcal{C}_{\mathbb{N}}$ is a homomorphic retract of any such monoid.

February 5, 2020 O. Gutik and
A. Savchuk
  • On homomorphic retracts of the momoid $\mathbf{I}\mathbb{N}_{\infty}$, II

    We discuss on homomorphic retracts of the momoid $\mathbf{I}\mathbb{N}_{\infty}$ of co-finite partial isometries of the set of positive integers $\mathbb{N}$. In particular, we construct a class homomorphic retracts of $\mathbf{I}\mathbb{N}_{\infty}$, which elements contains the submonoid $\mathcal{C}_{\mathbb{N}}$, generated by shifts of $\mathbb{N}$, such that $\mathcal{C}_{\mathbb{N}}$ is a homomorphic retract of any such monoid.

July 20, 2020 O. Gutik
  • On the monoid of cofinite partial isometries of positive integers

    We show that the monoid of cofinite partial isometries of integers does not contain an isomorphic copy of the monoid of cofinite partial isometries of positive integers. Also we prove that the monoid of cofinite partial isometries of positive integers has not a finite set of generators.
    This is a join work with Anatolii Savchuk.

    Video:
July 22, 2020 O. Gutik
  • On the monoid of cofinite partial isometries of positive integers, II

    We show that the monoid of cofinite partial isometries of integers does not contain an isomorphic copy of the monoid of cofinite partial isometries of positive integers. Also we prove that the monoid of cofinite partial isometries of positive integers has not a finite set of generators.
    This is a join work with Anatolii Savchuk.

    Video:
July 29, 2020 O. Gutik
  • On generating sets of the monoid of cofinite partial isometries of positive integers

    We show that the monoid of cofinite partial isometries of integers does not contain a minimal generating set.
    This is a join work with Anatolii Savchuk.

August 25, 2020 B. Ostash / Б. Осташ
  • Genetic code: definition, realization in the cell, and layers of information it enables
    Генетичний код: визначення, реалізація в клітині, і шари інформації, що він містить

    Genetic material of all life forms on Earth consists of four chemical units (nucleotides – adenine A, thymine T, guanine G, cytosine C), which one can view as letters of alphabet. These letters form linear sequence, or genome, in which, perhaps the most important part are genes encoding proteins. In this seminar the basic concept of genetic code will be outlined, and mechanisms of its realization in the cell; what is known about optimality of genetic code with regard to its precision, robustness in the face of errors (mutations) or evolvability. Current attempts to understand all the layers of information that coding sequence may carry will be reviewed, particularly in terms of degeneracy and synonymicity of genetic code. The issues of noncoding sequences and repeats in genetic material will be mentioned.
    Генетичний матеріал усіх форм Життя на Землі складається з чотирьох хімічних блоків (нуклеотидів – аденіну А, тиміну Т, гуаніну G та цитозину C), які можна розглядати як літери абетки. Ці літери складають лінійну послідовність, або геном, в якому, мабуть, найважливіша частина – це гени, що кодують білки. У ході семінару буде розглянуто концепцію генетичного коду, та механізми його реалізації в клітині; що відомо про оптимальність генетичного коду з точки зору його точності, стійкості до помилок (мутацій) чи здатності до еволюції. Буде розглянуто спроби зрозуміти, яку ще інформацію може містити кодувальна послідовність гена, зокрема унаслідок виродженості та синонімічності генетичного коду. Буде згадано проблему некодувальної послідовності та повторів у генетичному матеріалі.

    Video:

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