Sumários
Aula 27
19 Abril 2021, 15:30 • Maria João Antunes Dias Gouveia
Determination of (completely) join and meet irreducible elements in finite and infinite lattices.
Aula 25
14 Abril 2021, 11:30 • Maria João Antunes Dias Gouveia
Join-irreducible and meet-irreducible elements, completely join-irreducible and completely meet-irreducible elements of a lattice. Examples.
Aula 24
12 Abril 2021, 15:30 • Maria João Antunes Dias Gouveia
Congruence-distributive varieties. Jónsson's Lemma. The class of subdirectly irreducible algebras of a variety V is a subclass of HS(K) for any finite set K of finite algebras that generates V. Every lattice-based algebra is congruence-distributive.
S6 of Chapter IV and pages 79-80 of "A course in Universal Algebra", Burris and Sankappanavar
Aula 23: 08-04-2021, 14h30m-16h
9 Abril 2021, 13:00 • Maria João Antunes Dias Gouveia
Resolution of exercises related with distributive and modular lattices.