1FINITE ELEMENT PROBLEM. LAPLACIAN ON A  5 BY 5 GRID.                   LAP   25
             6             2             4             0             0          
PSE                       25            16            64             0          
(16I5)          (16I5)          (16I5)                                          
    1    5    9   13   17   21   25   29   33   37   41   45   49   53   57   61
   65                                                                           
    1    2    6    7    6    7   11   12   11   12   16   17   16   17   21   22
    2    3    7    8    7    8   12   13   12   13   17   18   17   18   22   23
    3    4    8    9    8    9   13   14   13   14   18   19   18   19   23   24
    4    5    9   10    9   10   14   15   14   15   19   20   19   20   24   25