Array ( [0] => Array ( [title] => L5A [link] => https://www.youtube.com/embed/GcnnPsmjxfA ) [1] => Array ( [title] => L5B [link] => https://www.youtube.com/embed/Ra2Wk0dlNbA ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第5R講 Vector Spaces and Subspaces I