Array ( [0] => Array ( [title] => L4A [link] => https://www.youtube.com/embed/H0qDymirNAg ) [1] => Array ( [title] => L4B [link] => https://www.youtube.com/embed/9QuNtzer-1o ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 4 | Linear autonomous ODEs; Example: Poincaré diagram;Flow-box theorem