Array ( [0] => Array ( [title] => L7A [link] => https://www.youtube.com/embed/aMXk0J9dQiY ) [1] => Array ( [title] => L7B [link] => https://www.youtube.com/embed/pjABEsgzBUU ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第7R講 Vector Spaces and Subspaces III