Conjectural abundance of pairs with large circle depth

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Let PP be a set of nn points in the plane in general position, meaning that no three are collinear and no four are cocircular. A pair of points has the required circle depth when every circle through the pair has at least the specified number of points of PP both inside and outside. The implied abundance conjecture. Every such set PP contains n+2n+2 pairs of points whose every circle has, both inside and outside, at least

⌊n4⌋−1\lfloor\tfrac{n}{4}\rfloor-1

points. This statement is presented as a direct implication of the preceding segment-depth conjecture, and is therefore open in the source.

References

Primary source

Pedro Ramos and Raquel Viaña, “Depth of segments and circles through points enclosing many points: a note”, arXiv:0803.1088 (2008).

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