Solutions of partial differential equations with computer algebra

Symbolic computation techniques for solutions of Partial Differential Equations (PDEs) with Maxima, an open source computer algebra system (CAS) are represented in three new packages. They are prepared in Maxima's user's language. After giving the initial and boundary conditions, packages automatically give the results and plot the graphs. The packages are designed as ready to use and modify instructional tools by users with computer-lab sessions of engineering courses. Solutions are performed by Finite Difference Method (FDM).