Zusammenfassung: In den deutschen Hochschulen tut sich einiges. Niedersachsens Wissenschaftsminister Oppermann fordert die Entstaatlichung der Hochschulen und bezeichnet die Studenten als Kunden. Die Internationalisierung der Forschung, das Vordringen von US-Bildungseinrichtungen auf den deutschen (Bildungs-)Markt, die begrenzten Mittel im Hochschulhaushalt und die Einführung von Wettbewerbsele...

The tensor product $$R\otimes S$$ of two algebras can have its multiplication deformed by a bicharacter to yield twisted ^t . We completely describe the Hochschild cohomology in terms components R and S, including full Gerstenhaber algebra structure. This description generalizes result Bergh Oppermann. A number interesting classes noncommutative arise as products, sometimes non-obvious ways. ma...

Herschend-Liu-Nakaoka introduced the notion of n -exangulated categories. It is not only a higher dimensional analogue extriangulated categories defined by Nakaoka-Palu, but also gives simultaneous generalization -exact in sense Jasso and ( + 2 ) -angulated Geiss-Keller-Oppermann. Let C be an category with enough projectives injectives, X cluster tilting subcategory . In this article, we show t...

Trygve Haavelmo got the Nobel prize in economics (the prize in memory of Alfred Nobel) in 1989 – essentially for his 1944 treatise: “The probability approach to econometrics”, where econometrics eventually was founded on probability and mathematical statistics and where simultaneous equation models were introduced. Haavelmo learned statistics from Frisch, and was influenced by Neyman. Ragnar Fr...

The evaluation of user interfaces becomes more and more important. The reasons are the increasing national and international standardization activities in the area of ergonomic requirements for visual display terminals (VDTs). These standards are often an integral part of the requirement specification for software. So the software developers have to consider the dialogue principles of the stand...

Triangulated categories were introduced independently in algebraic geometry by Verdier [7, 8], based on ideas of Grothendieck, and in algebraic topology by Puppe [6]. These constructions have since played a crucial role in representation theory, algebraic geometry, commutative algebra, algebraic topology and other areas of mathematics (and even theoretical physics). Recently, Geiss, Keller and ...