LIE SEMIGROUPS IN O(2,2)

Choi, Keun-Bae (Department of Mathematics Education Jeju National University of Education) ;
Lim, Yong-Do (Department of Mathematics Kyungpook National University)

We study $Ol'shanski\v{i}$ semigroups admitting triple decompositions in the Lie group O(2,2).