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- W3211032979 abstract "It is known that for every dimension d≥2 and every k<d there exists a constant cd,k>0 such that for every n-point set X⊂Rd there exists a k-flat that intersects at least cd,knd+1−k−o(nd+1−k) of the (d−k)-dimensional simplices spanned by X. However, the optimal values of the constants cd,k are mostly unknown. The case k=0 (stabbing by a point) has received a great deal of attention.In this paper we focus on the case k=1 (stabbing by a line). Specifically, we try to determine the upper bounds yielded by two point sets, known as the stretched grid and the stretched diagonal. Even though the calculations are independent of n, they are still very complicated, so we resort to analytical and numerical software methods. We provide strong evidence that, surprisingly, for d=4,5,6 the stretched grid yields better bounds than the stretched diagonal (unlike for all cases k=0 and for the case (d,k)=(3,1), in which both point sets yield the same bound). Our experiments indicate that the stretched grid yields c4,1≤0.00457936, c5,1≤0.000405335, and c6,1≤0.0000291323." @default.
- W3211032979 created "2021-11-08" @default.
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- W3211032979 date "2021-10-01" @default.
- W3211032979 modified "2023-10-18" @default.
- W3211032979 title "Obituary: Peter C. Fishburn (1936–2021)" @default.
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- W3211032979 doi "https://doi.org/10.1016/j.dam.2021.10.002" @default.
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