11

\[ O_{jk} = \sum_{i=1}^{n}\left(\frac{p_{ji}\cdot p_{ki}}{\sqrt{\sum_{i=1}^{n}p_{ji}^2 \cdot p_{ki}^2}}\right) \]

\[ O_{jk} = \sum_{i=1}^{n}\left(\frac{p_{ji} \cdot p_{ki}}{\sqrt{\sum_{i=1}^{n}p_{ji}^2 \cdot \sum_{i=1}^{n}p_{ki}^2}}\right) \]

\[
O_{jk} = \sum_{i=1}^{n}\left(\frac{p_{ji} \cdot p_{ki}}{\sqrt{\sum_{i=1}^{n}p_{ji}^2 \cdot \sum_{i=1}^{n}p_{ki}^2}}\right)
\]

[latex]O_{jk} = \sum\limits_{i=1}^{n}(p_{ji}\cdot p_{ki})/\sqrt{\sum \limits_{i=1}^{n}p_{ji}^2 \cdot p_{ki}^2}\tag{12}\label{12}[/latex]