Sommaire

Special m-hyperidentities in biregular leftmost graph varieties of type (2,0)
p. 81
Function classes and relational constraints stable under compositions with clones
p. 109
Hypersatisfaction of formulas in agebraic systems
p. 123
The maximal subsemigroups of the ideals of some semigroups of partial injections
p. 153
Two constructions of De Morgan algebras and De Morgan quasirings
p. 169
Semi-open sets in biclosure spaces
p. 181
Knowledge bases and automorphic equivalence of multi-models versus linear spaces and graphs
p. 203