set operations
:clap: math :clap: review
multiplication For set \mathcal{P}, matrix A:
\begin{equation} A \mathcal{P} = \left\{Ap \mid p \in \mathcal{P}\right\} \end{equation}
adding For sets \mathcal{P}, \mathcal{Q}:
\begin{equation} \mathcal{P} \oplus \mathcal{Q} = \left\{p+q \mid p \in \mathcal{P}, q \in \mathcal{Q}\right\} \end{equation}