On categorical shape theory
On categories determined by poset- and set-valued functors
On categories into which each concrete category can be embedded. II
On categories into which each concrete category can be embedded
On Categories of Relations
On categories of structures and classes of algebras [Book]
On categories of supertopological spaces
On categories over the closed categories of fuzzy sets
On Central Group Extensions and Homology
On Classes And Universes
On classification, logical educational materials, categories, and automata
On clones determined by their initial segments
On clones of relations
On closed lattices
On coalgebras and type transformations
We show that for an arbitrary Set-endofunctor T the generalized membership function given by a sub-cartesian transformation μ from T to the filter functor 𝔽 can be alternatively defined by the collection of subcoalgebras of constant T-coalgebras. Sub-natural transformations ε between any two functors S and T are shown to be sub-cartesian if and only if they respect μ. The class of T-coalgebras whose structure map factors through ε is shown to be a covariety if ε is a natural and sub-cartesian mono-transformation....
On Cohen-Macaulay rings
In this paper, we use a characterization of -modules such that to characterize Cohen-Macaulay rings in terms of various dimensions. This is done by setting to be the local cohomology functor of with respect to the maximal ideal where is the Krull dimension of .
On Cohomological Equivalence.
On cohomological periodicity for infinite groups.
On cohomology of graded group categories
On complete Saks spaces