Traps, Cores, Extensions and Subdirect Decompositions of Unary Algebras
Stojan Bogdanović, Miroslav Ćirić, Tatjana Radjenovic Petkovic, Balázs Imreh, Magnus Steinby · Fundamenta Informaticae · 1999
Subdirect decompositions of unary algebras are studied in connection with one-element subalgebras, cores, Rees extensions of congruences of subalgebras, dense extensions and disjunctive elements. In particular, subdirectly irreducible unary algebras