Semigroups of order-decreasing transformations: the isomorphism theorem.
Semigroups of order-preserving partial endomorphisms on trees, I
Semigroups with a noncommutative arithmetic.
Semigroups with A-semidistributive subsemigroup lattices.
Semigroups with Boolean Congruence Lattices.
Semi-ideals in semi-lattices
Semilattice structures on trees.
Semilattice theory with applications to point-set topology
Semilattices do not have equationally compact hulls
Semilattices of bisimple inverse semigroups.
Semilattices of finite arithmetical algebras
Semilattices of groups with distributive congruence lattice.
Semilattices of width 2.
Semilattices of width 3 whose decomposable elements form a chain.
Semilattices which must contain a copy of 2 N.
Semilattices with sectional mappings
We consider join-semilattices with 1 where for every element p a mapping on the interval [p,1] is defined; these mappings are called sectional mappings and such structures are called semilattices with sectional mappings. We assign to every semilattice with sectional mappings a binary operation which enables us to classify the cases where the sectional mappings are involutions and / or antitone mappings. The paper generalizes results of [3] and [4], and there are also some connections to [1].
Semilinearly and semilattice right ordered groups
Semi-local lattices
Semimatroids and their Tutte polynomials.
Semimodularity and weak modularity in subalgebra lattices of completely simple semigroups.