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MIT 18.06 Linear Algebra, Spring 2010 14 Online
OpenStudy (anonymous):

how to find the 4 subspaces of a matrix without elimination

OpenStudy (anonymous):

The row space of a matrix is orthogonal to the null space (and ditto for the column space and the null space of the transpose). It's trivial to find the row and columns spaces, so you can find the other two as well.

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