Array ( [0] => Array ( [title] => L7AR [link] => https://www.youtube.com/embed/5Jw2_y6VPrw ) [1] => Array ( [title] => L7BR [link] => https://www.youtube.com/embed/aBDU7QdMH1k ) [2] => Array ( [title] => L7CR [link] => https://www.youtube.com/embed/sFs7uxyClVc ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第7講 Ch.3 Algebra & number theory basics (2)