TY CONF TI ON THE APPLICATION OF PARTIAL OPERATIONS FOR THE DESCRIPTION OF INFORMATION SYSTEMS KW partial graphs KW graphs KW semigroups KW bicyclic semigroups KW algebraic actions KW congruence KW homomorphism JO SCIENTIFIC RESEARCH OF THE SCO COUNTRIES: SYNERGY AND INTEGRATION. Beijing. 4 august 2021 AU Arapina-Arapova, E.S. PY 2024 PB AUS PUBLISHERS