Array ( [0] => Array ( [title] => L25A [link] => https://www.youtube.com/embed/R3r_6BzTihE ) [1] => Array ( [title] => L25B [link] => https://www.youtube.com/embed/-1-DYW814Do ) [2] => Array ( [title] => L25C [link] => https://www.youtube.com/embed/pIBviTBqK5g ) [3] => Array ( [title] => L25D [link] => https://www.youtube.com/embed/9Sf9RcCmHzw ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第25講 Surjective Functions & Recurrence relation