public double BillinearForm(int i, int j)
{
return(Mu12(i) * CourantFunction.integrate_dx_dx(i, j, Elements) +
Beta(i) * CourantFunction.integrate_dx_fx(i, j, Elements) +
Sigma(i) * CourantFunction.integate_fx_fx(i, j, Elements) +
Alpha * Fi(1, i) * Fi(1, j));
}
protected double FiDx(int i, double x)
{
return(CourantFunction.Derivative(x, i, Elements));
}
protected double Fi(double x, int i)
{
return(CourantFunction.Fi(x, i, Elements));
}