I lied slightly in my recent note about direct factors. To determine
whether a subgroup H of G is a direct factor, one should, of course,
first check that <H,Centralizer(G,H)> = G before looking for comple-
mentary direct factors with Complement(Centralizer(G,H),Centre(H)).
_--_|\ C.R.B. Wright / \ Charles.Wright@maths.anu.edu.au \_.--._/ email@example.com v