6.1. 17,18,19,20

6.2. 1 t/m 10 (selection, relate to PDE2010.pdf,
page 15, ex 13 and integration by parts leading to 
((.,.)) and (.,.) formulation explained in the course. 
Pay attention to the boundary conditions
imposed on the testfunction.

Exercises in PDE2010.pdf, section 5.1.7