# Mathematica Japonica Vol. 46, No. 3

## Whole Number 186
November 1997

### CONTENTS

- Makoto Hayashi

- On the uniqueness of the closed orbits of the Lienard system
- 371--376

- Takemi Mizokami and Shou Lin

- On spaces with a ƒÐ-CF* pseudo-base
- 377--384

- Masatoshi Fujii and Masahiro Nakamura

- An application of operator means arising from a study on Wazan
- 385--386

- Jeong Sheok Ume and Keewan Kim and Tae Hwa Kim

- Common fixed point theorems for a generalized contraction
- 387--392

- G. S. Jeong

- An interesting property of probabilistic 2-metric spaces
- 393--402

- Tomasz Kubiak and Maria A. de Prada Vicente

- Hereditary normality plus extremal disconnectedness and insertion of a continuous function
- 403--405

- Dorota Krassowska and Ryszard Pluciennik

- A note on property (H) in Köthe-Bochner sequence spaces
- 407--412

- Troy L. Hicks

- Multivalued mappings on probabilistic metric spaces
- 413--418

- Seung Il Baik and Jong Youl Kim and Hee Sik Kim

- Q-upper algebras with the condition (S)
- 419--425

- J. Pak and Moo Ha Woo

- A remark on G-sequences
- 427--432

- Shinji Yamashita

- The Poincaré and the spherical densities
- 433--438

- Yuki Seo

- Variance in noncommutative probability
- 439--444

- Yuki Seo

- Independence in noncommutative probability
- 445--450

- Yevgeny V. Mamontov and Magnus Willander

- Asymptotic method of finite equation for bounded solutions of nonlinear smooth odes
- 451--461

- Masanori Kodama

- Probabilistic multiperiod inventory models under general demand
- 463--484

- Takeshi Sakuragi

- On fuzzy Quasi-ideals and their radicals in a commutative BCK-algebra
- 485--490

- Michiro Kondo

- Congruences and closed ideals in BCK-algebras
- 491--496

- Michiro Kondo

- Duality theorem for p-semisimple BCK-algebras
- 497--501

- Kyriakos Keremedis

- Continuous real valued functions in T4 spaces
- 503--508

- Jorma Arhippainen

- On functional representation of uniformly A-convex algebras
- 509--515

### International Plaza
Memorial Issue of the late Professor Paul Erdös
From the editorial committee

- A. Ádám and K. Györy and A. Sárközy

- The life and mathematics of Paul Erdös (1913--1996)
- 517--526

- Paul Erdös

- Some of my favourite unsolved problems
- 527--537

- On the Prizes offered by the late Professor Paul Erdös

- 538

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