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 9, Number 1

#### Publication Date: 1998

Strong Convergence Theorems Of Iterations For A Pair Of Nonexpansive Mappings In Banach Spaces

Takayuki Tamura; 1-16

Duality For Multiobjective Fractional Variational Problems With Generalized Invexity

DO SANG KIM, HUN KUK and GUE MYUNG LEE; 17-25

On Existence Of Solutions Of Nondegenerate Wave Equations With Nonlinear Damping Terms

JEONG JA BAE and JONG YEOUL PARK; 27-46

An Operator Version Of The Wilf-Diaz-Metcalf Inequality

JUN ICHI FUJII and TAKAYUKI FURUTA; 47-52

On Some Continuous Time Discounted Markov Decision Process

Mitsuhiro Hoshino; 53-61

On Weyl Spectrum And A Class Of Operators

YOUNGOH YANG; 63-70

Local Uniqueness Of The Unknown Diffusivity In Some Heat Conduction Problem

SHIN-ICHI NAKAMURA; 71-75

A New Characterization Of Homogeneous Real Hypersurfaces In Complex Space Forms

JUNG-HWAN KWON and YOUNG JIN SUH; 77-90

On Pseudo-Umbilical Surfaces With Nonzero Parallel Mean Curvature Vector In $\mathbb{C}P^{3}(\tilde{c})$

NORIAKI SATO; 91-96

On A Saito's Problem For The Generations Of von Neumann Algebras By Power Partial Isometries

Hideo TAKEMOTO; 97-104

Spectral Mapping Theorems And Weyl Spectra For Hyponormal Operators

MUNEO CHŌ and YOSHIHIKO NAGANO; 105-110

Metrics On $S^{3}$ Such That Brieskorn Curve Is A Geodesic

MASAHIRO YAMAGATA; 111-115