Invariable generation of infinite groups

A subset S of a group G invariably generates G   if G=〈sg(s)|s∈S〉G=〈sg(s)|s∈S〉 for each choice of g(s)∈Gg(s)∈G, s∈Ss∈S. In this paper we study invariable generation of infinite groups, with emphasis on linear groups. Our main result shows that a finitely generated linear group is invariably generated by some finite set of elements if and only if it is virtually solvable. We also show that the profinite completion of an arithmetic group having the congruence subgroup property is invariably generated by a finite set of elements.