HackerTube / Video
Lec 1 | MIT 18.06 Linear Algebra, Spring 2005
MIT OpenCourseWare

The first lecture of Gilbert Strang's MIT 18.06 Linear Algebra course, covering the geometry of linear equations. It opens a full 35-lecture university course.
It is HN's default recommendation for learning linear algebra, praised for Strang's teaching and for building real understanding useful in machine learning.
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