Impact Factor

__ 0.871_(2020), 1.039 (5-year, 2016--2020), 0.3_(2022), 0.6 (5-year, 2018--2022)

Editorial Board

Tadayoshi ADACHI Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606--8501, Japan
Katsunori IWASAKI Graduate School of Science, Hokkaido University, Sapporo 060--0810, Japan
Shigeaki KOIKE Faculty of Science and Engineering, Waseda University, Tokyo 169--8555, Japan
Hiroshi KOKUBU Graduate School of Science, Kyoto University, Kyoto 606--8502, Japan
Hideo KOZONO Faculty of Science and Engineering, Waseda University, Tokyo 169--8555, Japan
Shu NAKAMURA Faculty of Science, Gakushin University, Tokyo 171--8588, Japan
NGUYEN Van Minh Department of Mathematics and Statistics, University of Arkansas at Little Rock, AR 72204, USA
Hidetaka SAKAI Graduate School of Mathematical Sciences, The University of Tokyo, Tokyo 153--8914, Japan
Hideo TAKAOKA Graduate School of Science, Kobe University, Kobe 657--8501, Japan
Yoshio TSUTSUMI Institute for Liberal Arts and Sciences, Kyoto University, Kyoto 606--8501, Japan


__ The FUNKCIALAJ EKVACIOJ (International Series) was founded in April, 1958, and is published as a peer-reviewed journal three times per year by the DEPARTMENT OF MATHEMATICS, KOBE UNIVERSITY under the editorship of the DIVISION OF FUNCTIONAL EQUATIONS, THE MATHEMATICAL SOCIETY OF JAPAN. It serves for publishing original articles concerning the study of functional equations and related topics. Contribution is free of charge, and there are no restrictions on who can contribute. Titles of papers in previous volumes are found in this web site.
__ Inquiries except subscription orders should be written to:

Division of Functional Equations
The Mathematical Society of Japan
c/o Faculty of Science, Kobe University
Kobe 657-8501, Japan


__ Subscription should be prepaid. The price is $240.00 a volume (three numbers). Orders for subscription and back numbers are handled by:

Japan Publications Trading Co., Ltd.
P.O.Box 5030, Tokyo International, Tokyo, Japan
(2--1 Sarugaku-cho 1-chome, Chiyoda-ku, Tokyo, Japan)

The electronic version is provided only for subscribers of the paper version: a temporary access to the e-version for subscribers of the paper version.
Instruction for authors

__ The papers should be submitted electronically. Each manuscript should be prepared by using LaTeX with

\documentclass[a4paper,12pt]{article}______(LaTeX 2e)

Do not use any local commands, nor macros.
__ The manuscript should contain the following:

____ 1. Abstract (of approximately 10 lines without mathematical formulas and citation of references)
____ 2. Key Words and Phrases
____ 3. 2020 Mathematics Subject Classification Numbers

These should be put before Introduction, and no footnotes may be added except one acknowledging financial support.
Please avoid writing mathematical formulae inside the text environment in a way that causes excessive spacings between the lines or inappropriate line widths. For example, authors are asked to use mathematical formulae such as $1/2$, $\lim_{n\to\infty}$, $\sum_{n=1}^{\infty}$, unless there is some special reason.
Please also check the style of our bibliography in recent publications. Especially, our format of author names is "the family name, the initial of the first name".
__ The source file and the PDF file of the manuscript should be sent via e-mail to