The volume ends with a list of problems.

This volume contains papers which, for the most part, are based on talks given at an international conference on Lattices, Semigroups, and Universal Algebra that was held in Lisbon, Portugal during the week of June 20-24, 1988.

This book contains the contributions of the invited speakers.

We continue this investigation by looking at well-known specializations of the sheaf construction, namely Boolean powers and sub-Boolean powers, giving special emphasis to quasi-primal algebras A, such that the sub-Boolean powers of A form ...

... algebras . ( Abstract ) Notices Amer . Math . Soc . 18 , 633 . [ 1973 ] An embedding theorem for partial algebras and the free completion of a free partial algebra within a primitive class . Algebra Universalis 3 , 271–279 . P ...