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ISSN:1224-2519

Published by: Department of Mathematics and Informatics, Faculty of Sciences, University of Bacău, Spiru Haret 8, 600114 Bacău, ROMANIA

Editorial office

Staff editors

Honorary Editor : Valeriu Popa

Editor in Chief: Marcelina Mocanu

Editorial secretary: Alina-Mihaela Patriciu

Editorial board

Cornel Berceanu
Department of Mathematics and Informatics
University of Bacău, Romania

Elena Nechita
Department of Mathematics and Informatics
University of Bacău, Romania

Vasile Postolică
Department of Mathematics and Informatics
University of Bacău, Romania

Manuela Gîrţu
Department of Mathematics and Informatics
University of Bacău, Romania

Valer Nimineţ
Department of Mathematics and Informatics
University of Bacău, Romania

Mihai Talmaciu
Department of Mathematics and Informatics
University of Bacău, Romania

Advisory Editors

Cabiria Andreian Cazacu
Romanian Academy

Temistocle Bîrsan
Department of Mathematics
Technical University„Gh.Asachi”Iaşi, Romania

Toader Buhăescu
Department of Mathematics
University „Dunărea de Jos”,Galaţi, Romania

Adrian Corduneanu
Department of Mathematics
Technical University „Gh.Asachi” Iaşi,, Romania

Maximilian Ganster
Department of Mathematics
Graz University of Technology, Graz, Austria

J.K. Kohli
Department of Mathematics
University of Delhi, India

Radu Miron
Romanian Academy

Valeriu Popa
Department of Mathematics and Informatics
University of Bacău, Romania

Eveline Băeşu
Department of Engineering Mechanics
University of Nebraska-Lincoln,USA

Victor Blănuţă 
Department of Mathematics and Informatics
University of Bacău, Romania

Ionel Sorin Ciupercă
Institute de Mathematique Camille Jordan
Université Claude Bernard,Lyon,France

Brian Fisher
Department of Mathematics and Computer Science
University of Leicester, England

George Isac
Department of Mathematics and Computer Science
Royal Military College of Canada, Kingston, Ontario, Canada

Solomon Marcus
Romanian Academy

Takashi Noiri
Department of Mathematics
Yatsushiro College of Technology, Japan

Florentin Smarandache
Department of Mathematics
University of New Mexico, USA