The Nihonkai Mathematical Journal publishes original contributions in all disciplines in mathematics. Between 1964 and 1989, the journal was known as the Science Reports of Niigata University. Series A, Mathematics. Prior to that, Niigata University published mathematical literature as part of the Journal of the Faculty of Science, Niigata University. Series I, Mathematics, Physics and Chemistry.

### Volume 23, Number 2

#### Publication Date: 2012

Contents

An example of $2\times 2$ hyperbolic conservation laws admitting delta-shock waves

Hiroki Ohwa; 59-75

Characterization and automatic continuity of separating maps between Banach modules

Lida Mousavi and Fereshteh Sady; 75-91

The Dunkl-Williams constant of symmetric octagonal norms on $\mathbb{R}^2$

Hiroyasu Mizuguchi, Kichi-Suke Saito and Ryotaro Tanaka; 93-113

Approximation of Common Solutions for Monotone Inclusion Problems and Equilibrium Problems in Hilbert Spaces

Mayumi Hojo and Wataru Takahashi; 115-134

Instructions to Authors