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The LP Engine

SYMPHONY requires the use of a third-party callable library to solve the LP relaxations once they are formulated. Currently, CPLEX $^{\copyright}$is the only available option. Any LP solver with the appropriate capabilities can be interfaced with SYMPHONY by writing a set of interface routines contained in the file LP/lp_solver.c. Once the interface routines are written, the make file must be modified to link with the new LP solver.