On some experiments with time discretizations (and with mixed finite element for nonlinear field equations)

Two questions related to the numerical solution of parabolic equations are studied: the choice of the value theta in the theta -method, and the number of iterations in the solution of algebraic equations with matrix of the form M+ kappa (1- theta )K (M=mass matrix, K=stiffness matrix), for both linear and nonlinear problems. (7 refs)