1. Mathematisches Institut, Universit?t Würzburg, W-8700, Würzburg, Germany 2. Departmento de Matemática, Universidad Técnica F. Santa María, Valparaíso, Chile
Abstract:
A 2-periodic continuous real functionf is said to beperiodically monotone if it has the following property: there exist numbert1t2t3t1+2 such thatf is nonincreasing fort1t2 and nondecreasing int2tt3. For any 2-periodic, integrable real functiong with 02|g(t|dt) we define