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MIT Linear Algebra video:

“…Can you sort of think about 9 vectors in 9 dimensional space and take their combinations? That's really the central thought that you get kind of used to in linear algebra. Even though you can't really visualize it, you sort of think you can after a while. Those 9 columns and all their combinations may very well fill out the whole 9 dimensional space.       But if the 9th column happened to be the same as the 8th column and gave nothing new, then probably what it would fill out would be … I hesitate even to say this … it would be a sort of plane, an 8 dimensional plane inside 9 dimensional space. And it's those 8 dimensional planes inside 9 dimensional space that we have to work with eventually…” – Gilbert Strang MIT Lecture

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