Operations research Remember it

Never Forget How to Formulate an LP

Never forget the steps to formulate an LP model again

Lesson notes

Key points

Very / Variables: Very reminds you to define decision variables first, with units.
Old / Objective: Old stands for the objective function: maximise profit or minimise cost.
Cats / Constraints: Cats are the constraints: limited resources written as inequalities.
Never / Non-negativity: Never means non-negativity: variables cannot be less than zero.
Bite / Bounds check: Bite reminds you to check bounds and units before solving.

Takeaway: Variables, Objective, Constraints, Non-negativity: Very Old Cats Never.

Quick check: What should you define first when formulating an LP model?

The constraints
The objective
Decision variables

You cannot write objective or constraints until variables are defined.

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