Case 1 | When Genei loses one customer |
\(x_{i}^{-} = (x_{1}, \cdots, x_{i} - 1, x_{n})\) | |
Case 2 | When Genei gains one customer |
\(x_{i}^{+} = (x_{1}, \cdots, x_{i} + 1, x_{n})\) | |
Case 3 | When Genei loses one customer, while Genej gains one |
\(x_{{ij}}^{-+} = (x_{1}, \cdots, x_{i} - 1, x_{i+1}, \cdots, x_{j} + 1, x_{j+1}, \cdots, x_{n})\) | |
Case4 | When both Genei and Genej lose one customer |
\(x_{{ij}}^{--} = (x_{1}, \cdots, x_{i} - 1, x_{i+1}, \cdots, x_{j} - 1, x_{j+1}, \cdots, x_{n})\) |