# Vector Sum (벡터의 합)

If $\textbf{u}$ and $\textbf{v}$ are vector in 2-space of 3-space that are positioned so their initial points coincide,
then the two vectors form adjacent sides of a parallelogram, and the sum $\textbf{u}+\textbf{v}$ is the vector represented
by the arrow from the common initial point of $\textbf{u}$ and $\textbf{v}$ to the opposite vertex of the parallelogram.