Array ( [0] => Array ( [title] => L25A [link] => https://www.youtube.com/embed/lYGNbb4e2bs ) [1] => Array ( [title] => L25B [link] => https://www.youtube.com/embed/0xco7TTGyec ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第25R講 Chapter 7 : Sturm’s Comparision Theorem and Sturm-Liouville BVP