Array ( [0] => Array ( [title] => L13A [link] => https://www.youtube.com/embed/GyvdS6qgtMU ) [1] => Array ( [title] => L13B [link] => https://www.youtube.com/embed/ejx6pX1LHLY ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - Lecture 13 | Characteristic equations; Infinitely many eigenvalues of linear discrete DDEs