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hmm. I will stick with the integer flows for now. And the k=1 case
Seems reasonable = )
The first model seems fine. Though it is very hard to write the transit time constraints for the edge formulation. I'm also a bit curious to whether limiting the flow on each arc for a commodity to be integer, is strictly identical to limiting the flow on each path to be integer. It is easy to find a counter-example, but I could be that they have the same space of optimal solutions
what counts as an integer variable in the subproblem? For us the subproblems are RCSPPs, so they are always integer, no? but that doesn't meant that lambda naturally becomes integer, right?
in relation to the above. If edge flow variables are integers in can ultimately result in integer path variables.