Table 3 Definitions for decision variables.
From: Robust meal delivery service for the elderly: a case study in Hong Kong
Notation | Meaning |
|---|---|
\(y^k_{l}\) | binary decision variable: 1 if worker k serves client l, 0 otherwise |
\(x^k_{ij}\) | binary decision variable: 1 if worker k uses arc \((i,j)\in A\), 0 otherwise |
\(\phi _{ij}\) | binary decision variable: 1 if arc (i, j) is used in route of some van, 0 otherwise |
\(z^k_{i}\) | binary variable: 1 if worker k visits building i, 0 otherwise |
\(u_{i}^k\) | dummy variable for sub-tour elimination |
\(T_k\) | total time spent by worker k |
