KNITRO.jl and Complementarity Constraints

Specific Domains Optimization (Mathematical)
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If the solver supports complementarity constraints, which KINTRO.jl does, then you should use;

using JuMP
model = Model()
@variable(model, S_plus >= 0)
@variable(model, S_minus >= 0)
@expression(model, S, S_plus - S_minus)
@constraint(model, S_plus ⟂ S_minus)
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