Injektive Objekte in gewissen Kategorien der Verbände
Localizations of Maltsev varieties.
-permutable locally finitely presentable categories.
On covarieties of coalgebras
On equalizers in generalized algebraic categories
On locally small based algebraic theories
On the failure of Birkhoff's theorem for locally small based equational categories of algebras
One More Categorical Model of Universal Algebra.
Points of affine categories and additivity.
Sémantique catégorique des types : comprendre le système F
Spaces and equations
It is proved, for various spaces A, such as a surface of genus 2, a figure-eight, or a sphere of dimension ≠ 1,3,7, and for any set Σ of equations, that Σ cannot be modeled by continuous operations on A unless Σ is undemanding (a form of triviality that is defined in the paper).
Strong embeddings into categories of algebras over a monad. II.
There is no cogenerator of totally convex spaces
Über Ringe, welche dicht in ihrer Modulkategorie sind.
Zum Satz von Freyd und Kelly.