of;
Mathematics;
and;
Statistics,;
Ili;
Normal;
University,;
Xinjiang;
835000,;
P.;
R.;
China;
of;
Mathematics;
and;
Statistics,;
Northeast;
Normal;
University,;
Jilin;
130024,;
P.;
R.;
China;
拉普拉斯; 差分系统; 奇异; 正解; BVP; 一维; 二阶; 边界值问题;