Commutativity of set-valued cosine families

• Smajdor Andrzej,
• Smajdor Wilhelmina

Affiliations

Smajdor Andrzej

Institute of Mathematics, Pedagogical University of Cracow, Podchorca̧żych 2, 30-084, Kraków, Poland

Smajdor Wilhelmina

Institute of Mathematics, Silesian University of Technology, Kaszubska 23, 44-100, Gliwice, Poland