Grouplike Menger algebras.
Homomorphisms of direct powers of algebras
Homomorphisms of direct products of algebras
Homomorphisms of partial unary algebras
Homomorphisms of semigroups of binary relations.
How to make many-sorted algebras one-sorted
Ideals and congruence kernels of algebras
Ideals of binary relational systems
Idempotent pre-generalized hypersubstitutions of type .
Idempotent Subreducts of Semimodules over Commutative Semirings
Independence of Equational Classes
Independent subalgebras of a general algebra
Intersection Graphs of Set Families Closed under Intersection and Satisfying the Descending Chain Condition
Isomorphic algebraic pre-closures and equivalent set-systems
Join-closed and meet-closed subsets in complete lattices
To every subset of a complete lattice we assign subsets , and define join-closed and meet-closed sets in . Some properties of such sets are proved. Join- and meet-closed sets in power-set lattices are characterized. The connections about join-independent (meet-independent) and join-closed (meet-closed) subsets are also presented in this paper.
Korrekturen zur Arbeit: Über die Existenz von freien Algebren. Math. Z. 106, 312 - 320 (1968).
Lattice formulation of general algebraic dependence
Lattices of compatible relations
Lattices of quasiorders on universal algebras
Lattices of tolerances