Uniform dilations

Every sufficiently large finite setX in [0,1) has a dilationnX mod 1 with small maximal gap and even small discrepancy. We establish a sharp quantitative version of this principle, which puts into a broader perspective some classical results on the distribution of power residues. The proof is based on a second-moment argument which reduces the problem to an estimate on the number of edges in a certain graph. Cycles in this graph correspond to solutions of a simple Diophantine equation: The growth asymptotics of these solutions, which can be determined from properties of lattices in Euclidean space, yield the required estimate.N.A.-Research supported in part by a U.S.A.-Israel BSF grant.Y.P.-Partially supported by a Weizmann Postdoctoral Fellowship.     

Diophantine approximation in characteristiep

We study diophantine approximations to algebraic functions in characteristicp. We improve a theorem of Osgood, and give two classes of examples showing that this result is nearly sharp. One of these classes exhibits a new phenomenon.     

R/S分析的理论基础:分数布朗运动

探讨了R／S分析方法的理论基础．指出稳定的Levy分布作为R／S分析的理论基础有重大缺陷。分析了分数布朗运动与R／S分析在含义和逻辑上的紧密联系，提出了分数布朗运动是R／S分析的理论基础的观点，最后，对我国上海股票市场进行了实证分析，其检验结果证实了本文提出的观点。     

Polynomials dertermined by a few of their coefficients

We prove some results which indicate that a monic polynomial over a field of characteristic zero with exactly κ distinct zeros may be determined up to finitely many possibilities by any κ of its nonzero proper coefficients.     

Two codes related to hermitian forms

Hermitian forms, exponential sums and linear algebra give us the opportunity to construct two trace-codes and obtain their parameters.     

Squarefree numbers in sumsets

We solve a problem of Filaseta by proving, that if N is sufficiently large, A ⊆ [N], |A| > N/9 and A + Adoes not contain any squarefree integer then all elements of A are congruent to 0 (mod 4) or 2 (mod 4). In order to show the main result we characterize the structure of all dense sets, whose elements sum to no squarefree number.     

On Gauss's proof of Seeber's Theorem

Summary Gauss proved Seeber's Theorem, that the determinant of a reduced positive definite ternary quadratic form is at least half the product of its diagonal coefficients, by means of two determinantal identities whose origin has remained unclear. We examine Gauss's method from a general standpoint, as a method whereby, in certain circumstances, a polynomial in several variables may be shown to be non-negative on a convex polytope by representing it as a positive multilinear combination of the linear forms which determine the polytope. We show that Gauss's identities may be obtained in this manner and that the two identities can in fact be replaced by a simpler single identity which also gives Oppenheim's precise minimum for the determinant.     

Integration over the group space of SUq(2), Clebsch-Gordan coefficients, and related identities

We calculate the Clebsch-Gordan coefficients of SUq(2) by a Woronowicz integration over the group manifold and obtain a representation differing from that reached by working with theq-group algebra. These apparently different results must agree, however, and their equivalence implies aq-identity. On lettingq = 1, we shall obtain two results of different structures for the Clebsch-Gordan coefficients of SU(2) and their equivalence similarly implies an identity among the usual binomial coefficients. With the same approach, one may extend the Woronowicz integral of the product of two irreducible representations to products of many irreducible representations.     

Asymptotic structure for solutions of the Cauchy problem for Burgers type equations

Large time asymptotic structure for solutions of the Cauchy problem for a generalized Burgers equation is determined. In particular, Gelfand’s question about location of viscous shock waves for such equations is answered.