Contents:
Ali Taghavi Jelodar, Mohammad Sal Moslehian, Abolfazl Sanami. A ternary characterization of automorphisms of ${\mathbb B}({\mathscr H})$. 1--9.
Farzad Dadipour, Masatoshi Fujii, {Mohammad Sal Moslehian. Dunkl-Williams inequality for operators associated with $p$-angular distance. 11--20.
Takahiro Sudo. The stable rank and connected stable rank for certain non self-adjoint Banach algebras. 21--34.
Yousuke Araya. Nonlinear scalarizations and some applications in vector optimization. 35--45.
Ryo Ichihara, Satoshi Kawakami, Masafumi Sakao. Hypergroup extensions of finite Abelian groups by hypergroups of order two. 47--71.