Level 1

$A={\left[\begin{array}{ccccc}{a}_{11}& a_{12}& a_{13}& \cdots & a_{1n}\\ a_{21}& a_{22}& a_{23}& \cdots & a_{2n}\\ a_{31}& a_{32}& a_{33}& \cdots & a_{3n}\\ ⋮& ⋮& ⋮& \ddots & ⋮\\ a_{n1}& a_{n2}& a_{n3}& \cdots & a_{nn}\end{array}\right]}_{n\times n}$

$A={\left[\begin{array}{ccccc}1& 1/a_{21}& 1/a_{31}& \cdots & 1/a_{n1}\\ a_{21}& 1& 1/a_{32}& \cdots & 1/a_{n2}\\ a_{31}& a_{32}& 1& \cdots & 1/a_{n3}\\ ⋮& ⋮& ⋮& \ddots & ⋮\\ a_{n1}& a_{n2}& a_{n3}& \cdots & 1\end{array}\right]}_{n\times n}$

Level 2

$b_{ij}=a_{ij}/{\displaystyle \sum _{i=1}^n{a}_{ij}}$

$w_i={\displaystyle \sum _{j=1}^n{a}_{ij}}/n$

Level 3

$D={\left[a_{ij}\right]}_{nxn}X{\left[w_i\right]}_{nx1}={\left[d_i\right]}_{nx1}$

$\lambda ={\displaystyle \sum _{i=1}^n\frac{d_i}{w_i}}/n$