Abstract. Let X,| ·| be a seminormed space, Φ = (φ k ) a sequence of moduli, and B a sequence of infinite scalar matrices B i = (b i kj ). Let (λ, g λ ) and (Λ, g Λ ) be solid F-seminormed (paranormed) spaces of single and double number sequences, respectively. V. Soomer and E. Kolk proved in 1996-1997 that the set of all scalar sequences u = (u k ) with Φ(u) = (φ k (|u k |)) ∈ λ is a linear space which may be topologized by the F-seminorm (paranorm) g λ,Φ (u) = g λ (Φ(u)) under certain restrictions on Φ or (λ, g λ ). We generalize this result to the space of all X-valuedApplications are given in the case when Λ is the strong summability domain of a non-negative matrix method. Our corollaries and critical remarks outline results from more than thirty previous papers by many different authors.