difference between prisoner's dilemma and tragedy of the commons
Prisoner's dilemma Many real-life dilemmas involve multiple players.[29] Although metaphorical, Hardin's tragedy of the commons may be viewed as an example of a multi-player generalization of the PD: Each villager makes a choice for personal gain or restraint. The collective reward for unanimous (or even frequent) defection is very low payoffs (representing the destruction of the "commons"). A commons dilemma most people can relate to is washing the dishes in a shared house. By not washing dishes an individual can gain by saving his time, but if that behavior is adopted by every resident the collective cost is no clean plates for anyone.
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Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Andrea Gail All six of the crew were lost at sea.