Good evening, I need to include the solutions that GLPK gives on some difficult problems in a paper that I am about to publish. Due to the problems' difficulty I used the --proxy option of GLPK in command prompt and thus GLPK managed to find good solutions, although they are not optimal in all cases. As it is obvious, I have to mention in the paper that I did not use a brute force method with GLPK, since GLPK is unable to solve these problems that way. Instead, I have to mention that when I use the option --proxy things got a lot better. Nevertheless I have no idea about what the proxy heuristic is. Could any one give a short description of proxy heuristic that could be included in my paper? If someone is willing to do so, I would ask for a short, exact and formal description, without too much technical details. Thanks a lot for your time Ioannis Tassopoulos
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