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Feb 15, 2011 at 4:35 comment added user5810 This definition comes from my having seen it somewhere (I forget where) as a measure for map projections. f is the embedding, d is the distance between either vertices or points in R^3, depending on what its inputs are.
Feb 15, 2011 at 2:49 comment added Surikator What is f and what is the definition of d (which I suppose is a distance)?
Feb 15, 2011 at 2:34 comment added Igor Rivin Where does this definition come from?
Feb 15, 2011 at 2:32 history answered user5810 CC BY-SA 2.5