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Full blue points indicate members of the pareto set. Point (a) is the optimum for objective function 
for a given value of 
(red points). Point (b) minimizes 
for another value of 
(compared to green points). For a member of the Pareto set, say (c), any attempt to improve a goal involves worsening the other, point (d) for comparison. Empty blue points are other possible solutions that are worse than those in the Pareto set.
