A categorical concept of constraints for algebraic specifications -- The integration of logical and algebraic types -- Colimits as parameterized data types -- Empty carriers: The categorical burden on logic -- Monads, matrices and generalized dynamic algebra -- Foundations are rich institutions, but institutions are poor foundations -- Development of algebraic specifications with constraints -- Revised ACT ONE: Categorical constructions for an algebraic specification language -- Objects, object types, and object identification -- Categories for the development of algebraic module specifications -- Parameterized data type and process specifications using projection algebras -- Parameterized algebraic domain equations -- Semantical constructions for categories of behavioural specifications -- Relation-sorted algebraic specifications with built-in coercers: Parameterization and parameter passing -- On declarations -- Cauchy sequences in quasi-uniform spaces: Categorical aspects -- The construct PRO of projection spaces: its internal structure -- Categories and mathematical morphology -- Topological spaces for cpos -- On the topological structures of nets -- Description of the topological universe hull -- On residuated approximations -- On convergence of filters and ultrafilters to subsets.