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MIT 18.06 Linear Algebra, Spring 2010 78 Online
OpenStudy (danpak94):

Hi, I have a few questions on PS5. 1. S4.1 P9: I got the right blanks, but I don't understand why we can make the conclusion. 2. S4.1 P33: The solution doesn't show how to get nullspace and left nullspace. If {r1,r2} and {c1,c2} each contain linearly independent vectors, isn't the r=m=n, and therefore only zero vectors in nullspace and left nullspace (b/c no free variables)? How can {n1,n2} and {l1,l2} be non-zero vectors? S4.2 P34: I get everything in the solution up until it says that AB is rxr. Shouldn't it be mxn? Even if A=B', AB=nxn. How can we say AB is rxr? Thanks in advance!!

OpenStudy (anonymous):

Could you clarify where these problems can be found, or better yet, post the original questions themselves?

OpenStudy (danpak94):

All of the problems can be found on Strang's linear algebra course, assignments, problem set #5. I'm also attaching copies of the problem here.

OpenStudy (cuimengmeng):

hi,I have the same question with you. Thus,I think the answer should be dependent

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