ランド指数
c = | S ∗ | {\displaystyle c=|S^{*}|} , S ∗ = { ( o i , o j ) ∣ o i , o j ∈ X k , o i ∈ Y l 1 , o j ∈ Y l 2 } {\displaystyle S^{*}=\{(o_{i},o_{j})\mid o_{i},o_{j}\in X_{k},o_{i}\in Y_{l_{1}},o_{j}\in Y_{l_{2}}\}}
d = | S ∗ | {\displaystyle d=|S^{*}|} , S ∗ = { ( o i , o j ) ∣ o i ∈ X k 1 , o j ∈ X k 2 , o i , o j ∈ Y l } {\displaystyle S^{*}=\{(o_{i},o_{j})\mid o_{i}\in X_{k_{1}},o_{j}\in X_{k_{2}},o_{i},o_{j}\in Y_{l}\}}
(任意の 1 ≤ i , j ≤ n , i ≠ j , 1 ≤ k , k 1 , k 2 ≤ r , k 1 ≠ k 2 , 1 ≤ l , l 1 , l 2 ≤ s , l 1 ≠ l 2 {\displaystyle 1\leq i,j\leq n,i\neq j,1\leq k,k_{1},k_{2}\leq r,k_{1}\neq k_{2},1\leq l,l_{1},l_{2}\leq s,l_{1}\neq l_{2}} に対して)