###### Definition 3.5.10

If \(A\) is an \(m\times n\) matrix, we call the span of its columns the *column space* of \(A\) and denote it as \(\col(A)\text{.}\)

If \(A\) is an \(m\times n\) matrix, we call the span of its columns the *column space* of \(A\) and denote it as \(\col(A)\text{.}\)