Question 1205820
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I want to point out a significant flaw of this formulation.


Under this formulation, there are TWO different ways to make partition of the segment 
in the 3:1 ratio.


One partition is 3:1 in direction from D to F,
and totally different partition  is 3:1 in direction from F to D.



THEREFORE, an accurate mathematical formulation must indicate the direction of a partition.



Without it, the problem is a garbage for trash can.