Stabbing Simplices by Points and Flats
✍ Scribed by Boris Bukh; Jiří Matoušek; Gabriel Nivasch
- Publisher
- Springer
- Year
- 2008
- Tongue
- English
- Weight
- 567 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0179-5376
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
It is shown that for fixed 1 ~ 0, if X C PG (d, q) contains (1 + ~)q~ points, then the number of r-fiats spanned by X is at least C(r.)q (r+l)ts+l-r), i.e. a positive fraction of the number of r-fiats in PG(s + 1,q).
We give a new proof of the suhanalyticity of the regular locus of a p-adic suhanalytic set, replacing use of an approximation theorem by a more natural argument based on the flatness of certain homomorphisms given by Taylor expansions of strictly convergent power series at a non-standard point of ZT
A longstanding conjecture of Reay asserts that every set X of (m-1)(d +1)+k+1 points in general position in R d has a partition X 1 , X 2 , . . . , X m such that m i=1 conv X i is at least k-dimensional. Using the tools developed in [13] and oriented matroid theory, we prove this conjecture for d =