短語詞組短語singular two -point boundary value problem 奇異兩點邊值問題singular m -point boundary value problem 奇異msingular multi -point boundary value problem 奇異多點邊值問題singular three -point boundary value problem 奇異三點邊值問題two -point singular boundary value problems 兩點奇異邊值問題 返回 singular point value