Peter Mayr (CAUL, Universidade de Lisboa, Portugal)
15/10/2010 Sextafeira, 15 de Outubro de 2010, 11 horas, Sala 6.2.44, FCUL
Faculty of Sciences of the University of Lisbon, Buiding C6, 2nd Floor
Characterizing translations on groups by cosets of their subgroups
On a group, constant functions and left translations by group elements map left cosets into left cosets for every subgroup. We determine classes of groups for which this property of preserving cosets characterizes constants and translations, e.g. finite nonabelian groups that are perfect, partitioned, primitive, or generated by elements of prime order.
For certain classes of groups we construct other cosetpreserving functions, in particular, power endomorphisms and functions defined in terms of the subgroup lattice. Here our motivation to investigate the connection between the properties of a group and the properties of its subgroup lattice comes from Universal Algebra; the tools are from Group Theory. This is joint work with Andras Pongracz (ELTE Budapest) and Gabor Horvath (University of Debrecen). 
