Span의 정의는 다음과 같음. If $\textbf{v}_1, \cdots, \textbf{v}_p$ are in $\mathbb{R^n}$, then the set of all linear combinations of $\textbf{v}_1, \cdots, \textbf{v}_p$ is denoted by Span $\left\{\textbf{v}_1, \cdots, \textbf{v}_p\right\}$ and is called the subset of $\mathbb{R^n}$ spanned (or generated) by $\textbf{v}_1, \cdots, \textbf{v}_p$. That is, Span $\left\{\textbf{v}_1, \cdots, \textbf{v}_p\ri..