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1 We think of the two-commodity network problem as two directed capac-itated networks with side constraints which takes care of bounds on total ow. This formulation allows capacity intervals on individual ows in the arcs. We also expand the two directed networks with an extra node and arcs from this extra node to each of the original nodes. Then the ow in… (More)
We consider multicommodity network ow problems, where external ow is allowed to vary, and where ows in arcs of individual commodities may be constrained. Most other formulations of multicommodity networks are special cases of the one used in this paper. For this problem we describe the combinatorial structure of the bases.
For use in an Internet application on whole farm modelling we needed to determine a reasonable crop rotation given only the crops in the rotation and the number of hectares of each crop. The crop rotation problem considered in this paper is therefore that of determining hectares of precrops for each crop. Crop rotation modelling in general is traditionally… (More)