Gunawan, Hendra; Mashadi; Gemawati, Sri; Nursupiamin; Sihwaningrum, Idha
(2016-02-17)
In this paper we discuss some existing notions of orthogonality in 2-normed
spaces and their drawback. We also formulate new de¯nitions of orthogo-
nality that improve the existing ones. In the standard 2-normed space, ...