Mathematical questions around optimization model formulations

Non-convex QCQP: Gurobi 9.0.2 doesn't accept MIP start in presence of lazy callback
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Performing DFS in a graph through constraints
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Monitoring of the optimal value of variables as a matrix
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PuLP vs. Gurobi
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PuLP Model with Gurobi solver is very slow
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If constraints
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Solving for optimal Lagrangian multipliers
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SOS constraint of any type
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A big gap after 3 hours run!
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quicksum multiple quicksum
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There is in-feasibility issue in Gurobi
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MILP technique against SOS2 method: different result in two same models
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Add nonlinear optimization constraint
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Part-load efficiency curve modelling in Gurobi
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Binary variables
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Subtour elimination for directed graph with repeated vertices allowed.
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GurobiError: Unsupported type (<class 'numpy.ndarray'>) for LinExpr addition argument
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Decision variable type (floating point)
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Reduced Cost Attributes
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Extract Variable values during optimization
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adding a quadratic constraint for the sum of an inverse variable
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Formulation of LPs
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