2016/89/3 (1) — DOI: 10.5486/PMD.2016.7586 — pp. 263-275
Full Text Abstract

On extensions of the generalized cosine functions from some large sets

Authors: Anna Bahyrycz, Janusz Brzdȩk and Eliza Jabłońska

Keywords: generalized cosine function, d'Alembert's functional equation, restricted domain, abelian semigroup, involution, filter, ideal

Mathematics Subject Classification: 39B82, 39B52