Definition:Row Space

Definition
Let $\mathbf A$ be a matrix.

Let $\mathbf A^\intercal$ be the transpose of $\mathbf A$. Let the columns of $\mathbf A^\intercal$ be members of a vector space.

The row space of $\mathbf A$ is defined as the column space of $\mathbf A^\intercal$.

Also see

 * Left Null Space