hi all, free solver interalg <http://openopt.org/interalg> for global nonlinear optimization with specifiable accuracy now can handle categorical variables, disjunctive (and other logical) constraints, thus making it available to solve GDP, possibly in multiobjective form. There are ~ 2 months till next OpenOpt release, but I guess someone may find it useful for his purposes right now. See here <http://forum.openopt.org/viewtopic.php?id=564> for more details. Regards, D.
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