In connection with the proof of his celebrated "2.4-Theorem", Freiman proved that if Ξ± 1 , . . . , Ξ± N are real numbers such that each interval [u, u+1/2) contains at most n of the Ξ± j mod 1, then | N j =1 exp(2ΟiΞ± j )| 2n -N . Freiman's result was extended by Moran and Pollington, and recently by L
On the gap structure of sequences of points on a circle
β Scribed by Lyle Ramshaw
- Publisher
- Elsevier Science
- Year
- 1978
- Weight
- 831 KB
- Volume
- 81
- Category
- Article
- ISSN
- 1385-7258
No coin nor oath required. For personal study only.
β¦ Synopsis
Considerable mathematical effort h as gone in t o studying seq uences of points in t.he interval [0, I) which are even ly di stributed, in the se ns e that cer t a in interval s contain rou ghl y the correct percentages of t he first n points. This paper ex plores the related notion in which a sequen ce is even ly di stributed if its first n points split a give n circle into intervals which a re roughl y eq ual in len gth, regardless of their relative po sitions. The sequenc e Xk= (l Og 2 (2k-l) m od 1) was introduced in t h is context by D e Bruijn and E rd os . W e w ill see that tho gap struct u re of this seque nce is uniquely optimal in It certai n sens e, and op timal undo r a wide clas s of m easures .
π SIMILAR VOLUMES
We define B(x, y) to be the disk in the plane which has the points x,y as its diametral end points. Let liB(n) [or/Tn(n)] be the largest number such that for every set [or every convex set]P of n points in R 2, there exist two points x,y ~ P for which B(x,y) contains liB(n) [or hB(n)] points of P. W