Given a finite subset Ξ£βR and a positive real number
q<1 we study topological and measure-theoretic properties of the self-similar
set K(Ξ£;q)={βn=0ββanβqn:(anβ)nβΟββΞ£Ο}, which is the unique compact
solution of the equation K=Ξ£+qK. The obtained results are applied to
studying partial sumsets E(x)={βn=0ββxnβΞ΅nβ:(Ξ΅nβ)nβΟββ{0,1}Ο} of some
(multigeometric) sequences x=(xnβ)nβΟβ.Comment: 10 page