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Text and/or other creative content from Row space was copied or moved into Row and column spaces with this edit. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists.
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Section dimension:
"For example, the transformation R4 → R4 described by the matrix above maps all of R4 to some four-dimensional subspace."
Shouldn't it be "... some three-dimensional subspace"? See what it says in the paragraph directly over: "the 4 × 4 matrix in the example above has rank three."
