41 citations · 61 across the 6 of their papers we have counts for
6 papers
Maximal exact structures on additive categories
Dennis Sieg, Sven-Ake Wegner
We show that every additive category with kernels and cokernels admits a maximal exact structure. Moreover, we discuss two examples of categories of the latter type arising from fu…
Projective limits of weighted LB-spaces of holomorphic functions
Sven-Ake Wegner
Countable projective limits of countable inductive limits, called PLB-spaces, of weighted Banach spaces of continuous functions have recently been investigated by Agethen, Biersted…
On the notion of a semi-abelian category in the sense of Palamodov
Yaroslav Kopylov, Sven-Ake Wegner
In the sense of Palamodov, a preabelian category is semi-abelian if for every morphism the natural morphism between the cokernel of its kernel and the kernel of its cokernel is sim…
Exact couples in semiabelian categories revisited
Yaroslav Kopylov, Sven-Ake Wegner
Consider an exact couple in a semiabelian category in the sense of Palamodov, i.e., in an additive category in which every morphism has a kernel as well as a cokernel and the induc…
A short introduction to Gottlob Frege's Begriffsschrift
Sven-Ake Wegner
In his 1879 paper on the Begriffsschrift, Gottlob Frege introduced a notation to formalize mathematical arguments. In this note we explain Frege's notation by using the nowadays co…
Notes on a proof of Bonet, Engliš and Taskinen
Sven-Ake Wegner
We give a proof of a result of Bonet, Engliš and Taskinen filling in several details and correcting some flaws.