CENTER FOR COMPUTATIONAL MATHEMATICS COLLOQUIUM
                  UNIVERSITY OF COLORADO AT DENVER


TITLE:   Extending Fast Poisson Solvers to Unbounded Domains

SPEAKER: Roland Sweet, Math Department, CU-Denver

DATE:    Wednesday, February 1, 1995

PLACE:   Math Conference Room - Suite 540
         UCD Building, 1250 14th St., Denver

TIME:    2:30 pm (Refreshments served at 2:15 pm)

ABSTRACT: The solution of standard finite difference approximations to
Poisson and Helmholtz equations is easily and quickly obtained using Fast 
Poisson solvers such as those implemented in the package CRAYFISHPAK.  
However, the application of these algorithms is restricted to bounded,
regular domains.  Hockney and Beard gave a method for solving unbounded
domain problems in cartesian coordinates when Fast Fourier Transforms
are used to solve the equations.  In this talk we present an extension of
their method for solving Helmholtz equations in cylindrical and spherical
coordinates.