Index Sets and Their Members

The following index sets and their members are used in this example:

  • $\text {dept}, i, k \in \text {DEPTS}$

  • $\text {city}, j, l \in \text {CITIES}$

  • $(i,j,k,l) \in \text {IJKL} = \{ i \in \text {DEPTS},\  j \in \text {CITIES},\  k \in \text {DEPTS},\  l \in \text {CITIES}: i < k\} $