PLTMG: a Software Package for Solving Elliptic Partial Differential Equations: Users' Guide 8.0

Intended mainly for use as a reference manual, this third edition encompasses all the improvements of the newest version of the PLTMG software package, including the following:

• The data structures defining the domain (triangulation and skeleton) have been simplified; more general boundary conditions are allowed.
• The internal data structure (triangle tree) has been replaced by a simple triangulation; the adaptive algorithms have been revised to use this simple data structure.
• The linear equations solvers are multigraph methods, which are simple ILU factorizations with strong connections to the hierarchical basis multigrid method.
• The graphics packages have been improved and now include expanded options.
• The test driver has a new X-Windows gui option.