15 citations · 63 across the 18 of their papers we have counts for
4 papers · 1 filter
Universal Covers of Finite Groups
Heiko Dietrich, Alexander Hulpke
Motivated by quotient algorithms, such as the well-known -quotient or solvable quotient algorithms, we describe how to compute extensions of a finite group by a d…
Computing the real Weyl group
Heiko Dietrich, Willem A. de Graaf
Let g be a semisimple Lie algebra over the real numbers. We describe an explicit combinatorial construction of the real Weyl group of g with respect to a given Cartan subalgebra. A…
Constructing cocyclic Hadamard matrices of order 4p
Santiago Barrera Acevedo, Heiko Dietrich, Padraig O Cathain
Cocyclic Hadamard matrices (CHMs) were introduced by de Launey and Horadam as a class of Hadamard matrices with interesting algebraic properties. Ó Catháin and Röder described a cl…
On two group functors extending Schur multipliers
Heiko Dietrich, Primoz Moravec
Liedtke (2008) has introduced group functors and , which are used in the context of describing certain invariants for complex algebraic surfaces. He proved that these…