st> a sU_ 1 where t is the sum of the element valves ir over the mesh elements. Exawple, Mesh wilh two linear elements C=4 2 strein end e-1 2 1 xn nxn nx1 se=U-v 0= EE, U 1E(e- L Ue A Le ve- AsL E Us-Ue)=A EEue-Ug 2 e 2L l We hed obtained ke as ke AEEE1-4 1