\begin{definition}[Definition:Linearly Dependent/Sequence/Real Vector Space]
Let $\struct {\R^n, +, \cdot}_\R$ be a real vector space.
Let $\mathbf 0 \in \R^n$ be the zero vector.
Let $\sequence {\mathbf v_k}_{1 \mathop \le k \mathop \le n}$ be a sequence of vectors in $\R^n$.
Then $\sequence {\mathbf v_k}_{1 \mathop \le k \mathop \le n}$ is '''linearly dependent''' {{iff}}:
:$\ds \exists \sequence {\lambda_k}_{1 \mathop \le k \mathop \le n} \subseteq \R: \sum_{k \mathop = 1}^n \lambda_k \mathbf v_k = \mathbf 0$
where not all $\lambda_k$ are equal to $0$.
That is, it is possible to find a linear combination of $\sequence {\mathbf v_k}_{1 \mathop \le k \mathop \le n}$ which equals $\mathbf 0$.
\end{definition}