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Abstract incidence geometries like projective spaces, polar spaces, generalized polygons, as well as incidence problems in the real or complex Euclidean spaces (eg. Szemerédi–Trotter theorem).

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Is there a "Bipartite" Szemeredi-Trotter theorem?

One version of the Szemeredi-Trotter theorem states the following: Given a set of $L$ lines in the plane, the number of points incident to at least $k$ lines is bounded above by a constant times $L/k …
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