Good day I have encountered an optimization issue which I can not solve. I have to optimise a system to maximize profit. Method The objective function I defined is the profit. It includes 6 AUX variables and 1 IND variable. There are two more IND variables which were added but not included in the objective function. The solving method I chose is the IPOPT. Issue When I optimize, the profit decreases, and I am not quite sure why it doesn't increase. Any assistance would be greatly appreciated.