**About the Authors**Alkiviadis G. Akritas taught at the University of Kansas for twenty years before he moved to Greece, where he has been teaching and doing research in the Department of Computer and Communication Engineering at the University of Thessaly, in Volos, since 1998. His research interests are in the field of symbolic and algebraic computations (a field in which he has published extensively) and in using computer algebra systems to improve the teaching of mathematics. Based on Vincent's theorem of 1836, Akritas has developed the two fastest methods for isolating the real roots of polynomial equations; these methods have been incorporated, respectively, in the computer algebra systems Maple and

Mathematica.

Jerry Uhl is a professor of mathematics at the University of Illinois at Urbana-Champaign. He is the author or coauthor of a number of research papers. During the 1980s, Uhl served as real analysis editor of the research journal

Proceedings of the American Mathematical Society. He also served one term as managing editor of the same journal, as well as one term on the Council of the American Mathematical Society. Since 1988, Uhl has devoted nearly all his energies to Calculus&

Mathematica. In 1998, he received an award for distinguished teaching from the Mathematical Association of America.

Panagiotis S. Vigklas is a Ph.D. student in the Department of Computer and Communication Engineering
at the University of Thessaly, in Volos. He is currently working on his dissertation under the supervision of A. G. Akritas.

Alkiviadis G. Akritas
University of Thessaly

Department of Computer and Communication Engineering

37 Glavani & 28th October

GR-38221, Volos

Greece
akritas@uth.gr

inf-server.inf.uth.gr/~akritas/index.html

Jerry Uhl
University of Illinois at Urbana-Champaign

Department of Mathematics

273 Altgeld Hall (mc 382)

1409 W. Green

Urbana, IL 61801

USA

juhl@cm.math.uiuc.edu

Panagiotis S. Vigklas
University of Thessaly

Department of Computer and Communication Engineering

37 Glavani & 28th October

GR-38221, Volos

Greece
pviglas@uth.gr