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- W3124615899 abstract "In the present work we study parameter spaces of two line point configurations introduced by Boroczky. These configurations are extremal from the point of view of Dirac-Motzkin Conjecture settled recently by Green and Tao. They have appeared also recently in commutative algebra in connection with the containment problem for symbolic and ordinary powers of homogeneous ideals and in algebraic geometry in considerations revolving around the Bounded Negativity Conjecture. Our main results are Theorem A and Theorem B. We show that the parameter space of what we call $B12$ configurations is a three dimensional rational variety. As a consequence we derive the existence of a three dimensional family of rational $B12$ configurations. On the other hand the moduli space of $B15$ configurations is shown to be an elliptic curve with only finitely many rational points, all corresponding to degenerate configurations. Thus, somewhat surprisingly, we conclude that there are no rational $B15$ configurations." @default.
- W3124615899 created "2021-02-01" @default.
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- W3124615899 date "2016-11-14" @default.
- W3124615899 modified "2023-10-17" @default.
- W3124615899 title "From Pappus Theorem to parameter spaces of some extremal line point configurations and applications" @default.
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- W3124615899 doi "https://doi.org/10.1007/s10711-016-0207-8" @default.
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