Boundary Conditons 第一类边界条件u(a)=a0: 0=(a)=a0 第三类边界条件u(b)+6(b)=a1,这里主要处理导 数项u(b),一种方法: U 但是这样做使得边界上截断误差的精度(为O(h)低于 内点的逼近 difference methods for BVP 2003, Fudan University, Chen Wenbin-p. 7/50Boundary Conditons u ( a) = α 0 u 0 = u ( a) = α 0 u 0 ( b) + βu ( b) = α 1 u 0 ( b ), u 0 ( b ) ≈ u N − u N − 1 h ( O ( h ) ) difference methods for BVP, 2003, Fudan University, Chen Wenbin – p.7/50