© 1999 by London Mathematical Society
© The London Mathematical Society
Collineation Groups Preserving a Unital in a Projective Plane of Order m2 with m
1(4)
Dipartimento di Matematica, Università di Lecce Via Arnesano, 73100 Lecce, Italy Biliotti{at}ilenic.unile.it
Received 13 June 1996. Revision received 25 November 1997.
The structure of a collineation group G preserving a unital in a projective plane of order m2 with m
1(4) is investigated and several results are obtained about G, when G is a 2-group. These results are then used to investigate the structure of G/O(G) in the general case and, in particular, that of F*(G/O(G)).