# Operational Research

- Drum Buffer Rope Throughput - Calculate the throughput of a production system based on demand rate and constraint rate using Drum Buffer Rope (DBR) method from Theory of Constraints.
- Dual Method Feasibility Check - Feasibility check function for the Dual Simplex Method. Determines if the current solution has any negative coefficients, indicating if the solution is valid.
- Little's Law - Little's Law relates the number of items in a queuing system to the arrival rate and the time an item spends in the system, fundamental for operational research.
- Shadow Price in Linear Programming - Shadow price is the rate at which the value of the objective function changes with each additional unit of the resource in a linear programming problem.