The notion of identifying all [[Point|Ponits]] in [[Homogeneous Coordinates]] on the [[Lines|Line]] from $\tilde{0}$ to point $\tilde P$ to be referring to the same point $P$. $\huge \mat{x\\y\\z} \equiv \mat{\frac{x}{z} \\ \frac{y}{z} \\1} $ >[!info] >$ \huge \begin{align} > \let \tilde P &= \mat{x\\y\\z} \\ P &= \mat{\frac{x}{z} \\ \frac{y}{z}\\1} \end{align}$