e"=Ge""=∑cGv=∑c2v =1|cv+ C2V2+…+ nn 对于相当大的n,有 m)≈~C11 (n+1) ≈n+1 (n+1) 则 入1|=p(G) P椭圆型差分方程的送代送椭圆型差分方程的迭代法 对于相当大的n ，有 则                 + +         = + = =  =  = = − − n n n n n n N i i n i i N i i n i i n n c v c v c v e G e c G v c v 1 2 2 1 2 1 1 1 1 1 ( ) ( 1) 1         1 1 1 1 ( 1) 1 1 1 ( ) e c v e c v n n n+ n+     ( ) ( ) 1 ( 1) G e e n i n i   =  +