Hi, I want to convert below nonlinear constraint (this is the flow constraint for commodity flow problem) into linear. Please advise. \[ d_{i}^{r} = \sum_{k}x_{ik}d_{k}^{r} + s_{i} \] where \(x_{ik} \in \{0,1\} \) and other variables are continuous asked 27 Aug '13, 10:13 nicky Paul Rubin ♦♦ 
You can linearize each term in the summation, as posted here. answered 27 Aug '13, 16:35 Paul Rubin ♦♦ Thanks Paul...This helps me to understand how to do it.... :)
(28 Aug '13, 00:59)
nicky

Where's the nonlinearity? Is d a variable?
Austin: \(d\) is on both sides of the equation, and RHS depends on \(x\), so it pretty much has to be.