Title:      Computer Aided Geometric Design and Computer Algebra
Organizers: L. Gonzalez-Vega (Universidad de Cantabria, Spain)
            gvega@matesco.unican.es
            and
            J. R. Sendra (Universidad de Alcala, Spain)
            mtsendra@alcala.es

The aim of this session is to bring together the diverse groups
working on applications of Computer Algebra methods to Computer
Aided Geometric Design.  In previous IMACS-ACA Conferences, sessions with
the same kind of topics were organized:  "Parametric Curves and
Applications to Computer Aided Geometric Design (IMACS-ACA 1995)" and
"Geometric Modelling and Algebraic Methods in CAD (IMACS-ACA 1996)".

More precisely, this session is devoted to show the advantages and
disadvantages of using Computer Algebra when dealing with geometric
problems arising in Computer Aided Geometric Design in order
to manipulate curves and surfaces.

The problems to be addressed by this special session will cover at least
the following topics: implicitation, parametrization and reparametrization
algorithms, CAGD with exact arithmetic, algebraic-geometric manipulation of
offsets, roundings and blendings, algebraic computations with geometric
objects given approximately, solid modelling with implicit surfaces,
efficient computation with trimmed surfaces, etc.