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- NICOLÁS ANDRUSKIEWITSCH, Hans-Juergen Schneider
- 2002

This is a survey on pointed Hopf algebras over algebraically closed fields of characteristic 0. We propose to classify pointed Hopf algebras A by first determining the graded Hopf algebra grA… (More)

- Nicolás Andruskiewitsch, Hans-Juergen Schneider
- 1998

We propose the following principle to study pointed Hopf algebras, or more generally, Hopf algebras whose coradical is a Hopf subalgebra. Given such a Hopf algebra A, consider its coradical… (More)

We classify finite-dimensional complex Hopf algebras A which are pointed, that is, all of whose irreducible comodules are one-dimensional, and whose group of group-like elements G(A) is abelian such… (More)

- Paul Abreu, Wilhelm Adam, +467 authors M. Szczekowski
- 1997

Weak isosinglet Neutral Heavy Leptons ( m) have been searched for using data collected by the DELPHI detector corresponding to 3:3 10 hadronic Z decays at LEP1. Four separate searches have been… (More)

- T. Adye, Eliezer Agasi, +464 authors J. P. Tavernet
- 1996

Rare decays of beauty particles were studied in several charmless modes using the data collected with the DELPHI detector at LEP from 1991 to 1994. These decays are mediated by both tree level b ! u… (More)

- Paulo Giovanni de Abreu, Waldemar Adam, +459 authors Todor Georgiev Todorov
- 1998

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed… (More)

- Jaroslav Hamrle, S. Blomeier, O. Gaier, Burkard Hillebrands, Hans-Juergen Schneider, Gerhard Jakob
- 2007

Co 2 FeSi(100) films with L2 1 structure deposited onto MgO(100) were studied exploiting both longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical Kerr effect. The films exhibit a huge QMOKE… (More)

– We classify pointed finite-dimensional complex Hopf algebras whose group of group-like elements is abelian of prime exponent p, p > 17. The Hopf algebras we find are members of a general family of… (More)

X ×G→ X ×Y X, (x, g) 7→ (xg, x), is an isomorphism, which can be interpreted as the correct algebraic formulation of the condition that the G-action of X should be free, and transitive on the fibers… (More)

We study the Nichols algebra of a semisimple Yetter-Drin-feld module and introduce new invariants such as real roots. The crucial ingredient is a " reflection " in the class of such Nichols algebras.… (More)