a1 Department of Mathematics, University of Latvia, Raiņa bulvāris 19, Rīga, 1586, Latvia; firstname.lastname@example.org; web site:
a2 Institute of Electronics and Computer Science, Dzērbenes street 14, Rīga, 1006, Latvia; email@example.com
The necessary and sufficient conditions are extracted for periodicity of bi-ideals. They cover infinitely and finitely generated bi-ideals.
(Online publication June 3 2008)
Mathematics Subject Classification: