[Keortogonalan di ruang ber norm 2 = Orthogonality in 2 normed space;Keortogonalan di ruang ber-norm-2 = Orthogonality in 2-normed space;Keortogonalan di ruang ber-norm-2 = Orthogonality in 2-normed space, Keortogonalan di ruang ber-norm-2 = Orthogonality in 2-normed space]