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MIT 18.06 Linear Algebra, Spring 2010 13 Online
OpenStudy (anonymous):

In the 4th Lecture problems (decomposition into LU), the 2nd problem asks the conditions in which the LU decomposition holds. I'm not sure about some of those - for eg., why is c!=d necessary? They're the last pivot element - which can be 0. Also, if b =a or c =b, all b-a and c-b elements will become zero anyway - so we wouldn't have top worry about doing row exchanges. Am I wrong here?

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