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    $\begingroup$ The paper defines what it means by the convex hull on pp 4-5 and illustrates it with figure 5(a). $\endgroup$ Commented Oct 16, 2014 at 23:12
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    $\begingroup$ @whuber no it doesn't. It just mention its properties but doesn't say what it is. "In ROC space the convex hull is a crucial idea. Given a set of points in ROC space, the convex hull must meet the following three criteria". So it is a "crucial idea". That's not a definition, sir. $\endgroup$ Commented Oct 17, 2014 at 7:52
  • $\begingroup$ @JackTwain Are you being facetious? You cut off the quotation before the term is defined. The three criteria which follow characterize the convex hull. $\endgroup$ Commented Nov 23, 2016 at 0:32