Triangular quasi-Hopf algebra structures on certain non-semisimple quantum groups

One way to obtain Quantized Universal Enveloping Algebras (QUEAs) of non-semisimple Lie algebras is by contracting QUEAs of semisimple Lie algebras. We prove that every contracted QUEA in a certain class is a cochain twist of the corresponding undeformed universal envelope. Consequently, these contracted QUEAs possess a triangular quasi-Hopf algebra structure. As examples, we consider kappa-Poincare in 3 and 4 spacetime dimensions.Comment: 32 page

On Similarity Coefficients for 2×2 Tables and Correction for Chance

indices of association, resemblance measures, correction for chance, Cohen’s kappa, Scott’s pi, Mak’s rho, Goodman and Kruskal’s lambda, Hamann’s eta, simple matching coefficient, Dice/Sørenson coefficient,

The structure of marketing cooperative : A members perspective

This paper examines marketing cooperatives’ (MCs’) structure from a members’ perspective. We support the notion that the utility that members derive from the attributes of MC’s structure enhances our insight in members’ commitment. Using a conjoint experimental design, we elicit the utility that producers attach to attributes of a MC. These attributes are related to the cooperative’s internal organizational structure and strategic behavior. The results of 120 producers of a Dutch horticulture cooperative show that the selected cooperative attributes are significant drivers of members’ utility. In particular, members attach high importance to strategic attributes and prefer a more individualized cooperative structure