Array ( [0] => Array ( [title] => L14A [link] => https://www.youtube.com/embed/mZgUPv2K_d4 ) [1] => Array ( [title] => L14B [link] => https://www.youtube.com/embed/-vRo784bIdY ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 14 | Center manifolds(proof)