Automorphisms and enumeration of switching classes of tournaments.
Automorphisms of completely primary finite rings of characteristic p
A completely primary ring is a ring R with identity 1 ≠ 0 whose subset of zero-divisors forms the unique maximal ideal . We determine the structure of the group of automorphisms Aut(R) of a completely primary finite ring R of characteristic p, such that if is the Jacobson radical of R, then ³ = (0), ² ≠ (0), the annihilator of coincides with ² and , the finite field of elements, for any prime p and any positive integer r.
Automorphisms of regular wreath product -groups.
Blocking sets which are preserved by transitive collineation groups.
Calcul du centralisateur d'un groupe de permutations
Cayley color graphs of inverse semigroups and groupoids
The notion of Cayley color graphs of groups is generalized to inverse semigroups and groupoids. The set of partial automorphisms of the Cayley color graph of an inverse semigroup or a groupoid is isomorphic to the original inverse semigroup or groupoid. The groupoid of color permuting partial automorphisms of the Cayley color graph of a transitive groupoid is isomorphic to the original groupoid.
Characterisation of Some Steiner Systems, Parallelisms, and Biplanes.
Chohomological Aspects of Two-Graphs.
Completely 0-simple semigroups and their associated graphs and groups.
Congruence classes of orientable 2-cell embeddings of bouquets of circles and dipoles.
Construction of finite -groups with prescribed group of noncentral automorphisms
Das Einbettungsproblem für algebraische Zahlkörper bei Beschränkung der Verzweigung.
Decomposition of special Jacobi sets
Der Darstellungssatz der Allgemeinen Differenzenmethode.
Die Ordnung der Automorphismengruppe einer p-adischen Schottkykurve.
Die Struktur der absoluten Galoisgruppe über dem Körper R (t).
Dihedral f-tilings of the sphere by equilateral and scalene triangles-I
Doubly Primitive Vertex Stabilisers in Graphs.
Ein spiegelungsgeometrischer Aufbau der Galileischen Geometrie
Extensions icosaédriques