results in this area. The graphs are specified by means of so-called delta-sequences of the length given by the number of vertices in the graph. The m-th element of the sequence d(m) is the difference I(m) - [...] about the maximum area of a planar set A, having the property that among any three points in A at least two are at distance less than or equal to 2? In the first part of the talk I will discuss the, devious [...] more inequalities. In this direction, the Boolean Quadric Polytope (BQP) is best possible in the sense that its projection is the convex hull of the graph of the function, in other words, it provides an
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