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[D] Objective Function of the Travelling Salesman Problem
If you can not take the derivative of your objective function - is the idea of "convexity" irrelevant?
Whenever I look at the mathematical definitions of "convexity" - there always eventually seems to be a requirement that for the idea of "convexity" to apply, the function must be differentiable (i.e. you can take the derivative). For instance: we say that a Non-Convex Function can have Saddle Points - and Saddle Points are points on a function where the second derivatives …!-->