JSM l gorzata Wróbel - Tatra Mt. Math. Publ, 2019 - academia.edu
Given a ϕ-function ϕ and k∈ N, we introduce and study the concept of (ϕ, k)-variation in the
sense of Riesz of a real function on a compact interval. We show that a function u:[a, b]→ R …