Array ( [0] => Array ( [title] => L9A [link] => https://www.youtube.com/embed/8pmUWIJt-As ) [1] => Array ( [title] => L9B [link] => https://www.youtube.com/embed/eCeosiutYBc ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 9 | Stable manifolds and unstable manifolds