Positive definite matrices (tests), Tests for minimum, and Ellipsoids in R^n -- Lecture 27. Learn how to determine if a matrix is positive definite and how to test a matrix for a minimum.
Gilbert Strang, 18.06 Linear Algebra, Spring 2005. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed November 23, 2008). License: Creative Commons BY-NC-SA.
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