Partial orders and their semigroups of closed relations.
Partial orders in semigroups and semirings of right quotients.
Partially simple semigroups
p-congruences on p-regular semigroups.
Perfect completely semisimple inverse semigroups.
Periodic properties of groupbound semigroups.
Periodic properties of groupbound semigroups II.
Periodic weakly-cancellative semigroups.
Permutability of congruences on commutative semigroups.
Permutable duo semigroups.
Permutable transformation semigroups.
Permutation properties and the Fibonacci semigroup.
Polars and X-ideals in semigroups
Polynomial functions over commutative semigroups.
Positive functions from -indecomposable semigroups into partially ordered sets
Positive rational semigroups and commutative power joined cancellative semigroups without idempotent
Power cancellative semigroups.
Power series developments in lattice ordered semigroups.
Powers of subsets in a finite semigroup.
Poznámka k maximálnym ()-ideálom v pologrupách