3 papers
math.LO2025
Classical Set Theory: Theory of Sets and Classes
Taras Banakh
This is a short introductory course to Set Theory, based on axioms of von Neumann--Bernays--Gödel (briefly NBG). The text can be used as a base for a lecture course in Foundations…
math.CO2025
Enumerations of 1-rotational Steiner systems
Ivan Hetman, Taras Banakh, Alex Ravsky
In this paper new -rotational 2-Steiner systems for different admissible pairs are introduced. In particular, -rotational unitals of order are enumerated.
math.CO2025
Point-transitive and 1-rotational unitals of order 5
Ivan Hetman, Taras Banakh, Alex Ravsky
In this paper we introduce enumeration of unitals of order , which are also Steiner systems , where automorphism group acts transitively and effectively on points or…