9.     1.    Solve the Dirichlet problem for the Heat Equation:    

 

                       :    ,          

 

        Initial condition:                  

               

        Boundary conditions:         ,                  (Dirichlet)

                                                                          (Dirichlet)

       

        2.    Sketch the graph of solution for L=3 and a=0.1 and initial conditions:

 

                                a)           

                                b)   

                                c)                  cc)

 

        3.    Observe the Maximum principle for the Dirichlet problem for the Heat Equation