Hello I have some problems with formal notations, I have to sum (do the union?) of two sets and the sum (union?) of a set and a row of a matrix, is this notation correct?
1) Imagine $T_1 = \{1,2\}$ and $T_2 = \{2,3\}$, will \begin{equation} \Sigma^{2}_{i=1}T_i \end{equation} give me $\{1, 2, 3\}$ ? or should I use a different notation?
2) Imagine an adjacency matrix n · n called $A$ and consider the first row $[1,j]A$ as [0,0,1,0,2] and I want to transform it in a set and add the elements in a set of the previous T, for example imagine $T_1=\{1,4\}$, will
\begin{equation} T_1 + [1,j]A \end{equation} give me $\{0,1,2,4\}$ ? or should I use a different notation?