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- Meinolf Geck, Gerhard Hiss, Frank Lübeck, Gunter Malle, Götz Pfeiffer
- Applicable Algebra in Engineering, Communication…
- 1996

CHEVIE is a computer algebra package which collects data and programs for the representation theory of finite groups of Lie type and associated structures. We explain the theoretical and conceptual background of the various parts of CHEVIE and we show the usage of the system by means of explicit examples. More precisely, we have sections on Weyl groups and… (More)

We determine for all simple simply connected reductive linear algebraic groups defined over a finite field all irreducible representations in their defining characteristic of degree below some bound. These also give the small degree projective representations in defining characteristic for the corresponding finite simple groups. For large rank Ð our bound… (More)

- Frank Lübeck, Max Neunhöffer
- Experimental Mathematics
- 2001

We describe a new implementation of direct condensation, which is a tool in computational representation theory. The crucial point for this is the enumeration of very large orbits for a group acting on some set. We present a variation of the standard orbit enumeration algorithm that reduces the amount of storage needed and behaves well under… (More)

- Frank Lübeck
- J. Symb. Comput.
- 2002

We describe a " semi-modular " algorithm which computes for a given integer matrix A of known rank and a given prime p the multiplicities of p in the factorizations of the elementary divisors of A. Here " semi-modular " means that we apply operations to the integer matrix A but the operations are driven by considering only reductions of row vectors modulo… (More)

For the purposes of [K] and [KM] it became necessary to have 7 × 7 matrix generators for a Sylow-3-subgroup of the Ree groups 2 G 2 (q) and its normalizer. For example in [K] we wanted to show that in a seven dimensional representation the Jordan canonical form of any element of order nine is a single Jordan block of size 7. In [KM] we develop group… (More)

We report on the project of parallelising GAP, a system for computational algebra. Our design aims to make concurrency facilities available for GAP users, while preserving as much of the existing code base (about one million lines of code) with as few changes as possible and without requiring users---a large percentage of whom are domain experts in their… (More)

• contains library files holding information for finite complex reflection groups giving conjugacy classes, fake degrees, generic degrees, irreducible characters, representations of the groups and the associated Hecke algebras. The package is loaded using the command RequirePackage("chevie") (see 0.1). Compared to version 3, it is more general. For example,… (More)

- Herbert Pahlings, Meinolf Geck, +5 authors Reinhard Waldmüller
- 2003

Last but not least bedanke ich mich bei meinen Eltern, die mir — neben vielem Anderen — die Ausbildung ermöglicht haben, ohne die ich die vorliegende Arbeit nicht hätte erstellen können. 1, n)} die Menge der Nachbartranspositionen in S n. Dann lässt sich jedes Element von S n als Produkt von Elementen von S schreiben. Die Iwahori-Hecke-Algebra H A (u) zur… (More)

- Isabel M. Araújo, Robert Arthur, +35 authors Heiko Theißen
- 2000