Heinrich Maschke

Maschke functors, semisimple . . . Applications

Maschke functors, semisimple functors and separable functors of the second kind. Abstract We introduce separable functors of the second kind (or H-separable functors) and H-Maschke functors. H-separable functors are generalizations of separable functors. Various necessary and sufficient conditions for a functor to be H-separable or H-Maschke, in terms of generalized (co)Casimir elements (integr...

Relative Approximations and Maschke functors

The notion of approximations relative to a functor is introduced and several characterizations of relative (dual) Maschke functors are given by using them. As an application, the injective objects in the category of comodules over a coring are described.

Johann Heinrich Dierbach (1788–1845)

his eighties. In 1835, he married and settled in Paris as a teacher at the Conservatoire des Arts et Metiers, while conducting agricultural experiments with his brother-in-law on an estate in the Alsace, which was sustained economically by revenues from oil-bearing sands. Although McCosh's account of the collaboration with Dumas and the fat controversy with Liebig does not replace that given by...

Otto Heinrich Warburg, 1883-1970.

Frobenius Properties and Maschke-type Theorems for Entwined Modules

Entwined modules arose from the coalgebra-Galois theory. They are a generalisation of unified Doi-Hopf modules. In this paper, Frobenius properties and Maschke-type theorems, known for Doi-Hopf modules are extended to the case of entwined modules.