PD shows up as one of ten examples of traps in that long article. Note too that not every local minima is going to be a PD, or even close! Equilibria are someti

PD shows up as one of ten examples of traps in that long article. Note too that not every local minima is going to be a PD, or even close! Equilibria are sometimes now confused with PDs, due to the publicity given to Nash's Equilibrium, but that's a popular confusion.