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1.
 In this paper we completely solve the family of Thue equations
where is an integral parameter. In particular, for , the only solutions are the trivial ones with x = 0 or y = 0. The result is achieved by sharpening the estimates of part I of the paper and by solving Thue equations with the method of Bilu and Hanrot. (Received 25 January 2000; in revised form 10 April 2000)  相似文献   

2.
 For any irrational , let denote the regular continued fraction expansion of x and define f, for all z > 0 by and by J. GALAMBOS proved that (μ the Gauss measure)
In this paper, we first point out that for all , ( has no limit for for almost all , proving more precisely that: For all , one has for almost all
  相似文献   

3.
 It is well known that the recurrence relations
are periodic, in the sense that they define periodic sequences for all choices of the initial data, and lead to sequences with periods 2, 5 and 8, respectively. In this paper we determine all periodic recursions of the form
where are complex numbers, are non-zero and . We find that, apart from the three recursions listed above, only
lead to periodic sequences (with periods 6 and 8). The non-periodicity of (R) when (or and ) depends on the connection between (R) and the recurrence relations
and
We investigate these recursions together with the related
Each of (A), (B), and (C) leads to periodic sequences if k = 1 (with periods 6, 5, and 9, respectively). Also, for k = 2, (B) leads to periodicity with period 8. However, no other cases give rise to periodicity. We also prove that every real sequence satisfying any of (A), (B), and (C) must be bounded. As a consequence, we find that for an arbitrary k, every rational sequence satisfying any of (A), (B), and (C) must be periodic. (Received 27 June 2000; in revised form 5 January 2001)  相似文献   

4.
 We complement, extend, and sharpen some known inequalities for sine sums. Our main result is the following refinement of the classical Fejér-Jackson inequality: For all integers n ⩾ 2 and real numbers x ∈ (0,π) we have
with the best possible constant factor α = 1. This improves an inequality due to Turán. Received February 12, 2002 Published online April 4, 2003  相似文献   

5.
We consider equations of the form L*μ = 0 for bounded measures on _boxclose^d {\mathbb{R}^{d}} , where L is a second order elliptic operator, for example, Lu = Δu + (b,∇u), and the equation is understood as the identity
òLudm = 0 \int {Lud{\mu} = 0}  相似文献   

6.
In an unbounded domain Ω in ℝ n (n ≥ 2) with a compact boundary or Ω = ℝ n , we investigate the existence of limits at infinity of positive superharmonic functions u on Ω satisfying a nonlinear inequality like as
where Δ is the Laplacian and c > 0 and p > 0 are constants. The result is applicable to positive solutions of semilinear elliptic equations of Matukuma type. This work was partially supported by Grant-in-Aid for Young Scientists (B) (No. 19740062), Japan Society for the Promotion of Science.  相似文献   

7.
 In this paper, we prove that if β1,…, β n are p-adic numbers belonging to an algebraic number field K of degree n + 1 over Q such that 1, β1,…,β n are linearly independent over Z, there exist infinitely many sets of integers (q 0,…, q n ), with q 0 ≠ 0 and
with H = H(q 0,…, q n ). Therefore, these numbers satisfy the p-adic Littlewood conjecture. To obtain this result, we are using, as in the real case by Peck [2], the structure of a group of units of K. The essential argument to obtain the exponent 1/(n-1) (the same as in the real case) is the use of the p-adic logarithm. We also prove that with the same hypothesis, the inequalities
have no integer solution (q 0,…, q n ) with q 0 ≠ 0, if ɛ > 0 is small enough.  相似文献   

8.
 Let K be a field of characteristic 0 and let p, q, G 0 , G 1 , P ∈K[x], deg P ⩾ 1. Further, let the sequence of polynomials (G n (x)) n=0 be defined by the second order linear recurring sequence
In this paper we give conditions under which the diophantine equation G n (x) = G m (P(x)) has at most exp(1018) many solutions (n, m) ε ℤ2, n, m ⩾ 0. The proof uses a very recent result on S-unit equations over fields of characteristic 0 due to Evertse, Schlickewei and Schmidt [14]. Under the same conditions we present also bounds for the cardinality of the set
  相似文献   

9.
 For any irrational , let denote the regular continued fraction expansion of x and define f, for all z > 0 by and by J. GALAMBOS proved that (μ the Gauss measure)
In this paper, we first point out that for all , ( has no limit for for almost all , proving more precisely that: For all , one has for almost all
Then we prove mainly the more precise result: For all , the sequence has no subsequence which converges almost everywhere. (Re?u le 4 mai 1998; en forme révisée le 25 février 1999)  相似文献   

10.
 Let K be a field of characteristic 0 and let p, q, G 0 , G 1 , P ∈K[x], deg P ⩾ 1. Further, let the sequence of polynomials (G n (x)) n=0 be defined by the second order linear recurring sequence
In this paper we give conditions under which the diophantine equation G n (x) = G m (P(x)) has at most exp(1018) many solutions (n, m) ε ℤ2, n, m ⩾ 0. The proof uses a very recent result on S-unit equations over fields of characteristic 0 due to Evertse, Schlickewei and Schmidt [14]. Under the same conditions we present also bounds for the cardinality of the set
In the last part we specialize our results to certain families of orthogonal polynomials. This work was supported by the Austrian Science Foundation FWF, grant S8307-MAT. The second author was supported by the Hungarian National Foundation for Scientific Research Grants No 16741 and 38225. Received June 5, 2001; in revised form February 26, 2002 RID="a" ID="a" Dedicated to Edmund Hlawka on the occasion of his 85th birthday  相似文献   

11.
 In a recent paper [7] the author considered the family of parametrized Thue equations
for monic polynomials which satisfy
Under some technical conditions it could be proved that there is a computable constant such that for all integers the only integer solutions of the Diophantine equation satisfy . In this paper, we give an explicit expression for depending on the polynomials . (Received 5 September 2000; in revised form 30 December 2000)  相似文献   

12.
In this paper we prove a stochastic representation for solutions of the evolution equation
where L  ∗  is the formal adjoint of a second order elliptic differential operator L, with smooth coefficients, corresponding to the infinitesimal generator of a finite dimensional diffusion (X t ). Given ψ 0 = ψ, a distribution with compact support, this representation has the form ψ t  = E(Y t (ψ)) where the process (Y t (ψ)) is the solution of a stochastic partial differential equation connected with the stochastic differential equation for (X t ) via Ito’s formula.   相似文献   

13.
Let B 0,B 1, ⋯ ,B n be independent standard Brownian motions, starting at 0. We investigate the tail of the capture time
where 0<b i ≤ 1, 1 ≤in. In particular, we have ?τ3=∞ and ?τ5<∞. Various generalizations are also studied. Received: 10 January 2000 / Revised version: 12 January 2001 /?Published online: 14 June 2001  相似文献   

14.
 We consider the nonlinear Schr?dinger equation
where W(x) = V(x) − E. We establish the existence of the least energy solutions. We also formulate conditions guaranteeing the existence of multiple solutions in terms of the Lusternik–Schnirelemann category. Received March 30, 2001; in revised form May 29, 2002  相似文献   

15.
A random rectangle is the product of two independent random intervals, each being the interval between two random points drawn independently and uniformly from [0,1]. We prove that te number C n of items in a maximum cardinality disjoint subset of n random rectangles satisfies
where K is an absolute constant. Although tight bounds for the problem generalized to d > 2 dimensions remain an open problem, we are able to show that, for some absolute constat K,
Finally, for a certain distribution of random cubes we show that for some absolute constant K, the number Q n of items in a maximum cardinality disjoint subset of the cubes satisies
Received: 1 September 1999 / Revised version: 3 November 2000 / Published online: 14 June 2001  相似文献   

16.
Hydrodynamic large scale limit for the Ginzburg-Landau ∇φ interface model was established in [6]. As its next stage this paper studies the corresponding large deviation problem. The dynamic rate functional is given by
for h=h(t,θ),t∈[0,T],θ∈? d , where σ=σ(u) is the surface tension for mean tilt u∈ℝ d . Our main tool is H −1-method expoited by Landim and Yau [9]. The relationship to the rate functional obtained under the static situation by Deuschel et al. [3] is also discussed. Received: 22 February 2000 / Revised version: 19 October 2000 / Published online: 5 June 2001  相似文献   

17.
Using measure-capacity inequalities we study new functional inequalities, namely L q -Poincaré inequalities
and L q -logarithmic Sobolev inequalities
for any q ∈ (0, 1]. As a consequence, we establish the asymptotic behavior of the solutions to the so-called weighted porous media equation
for m ≥ 1, in terms of L 2-norms and entropies.   相似文献   

18.
 Suppose that {R n } n ⩾ 0 is a sequence of integers satisfying a binary linear recurrence relation with suitable conditions. We prove the transcendency of the numbers
where a is a nonzero algebraic number and b, c, and d are integers with c ⩾ 1 and d ⩾ 2, and that of similarly constructed numbers, using a new theorem on the transcendence of functions.  相似文献   

19.
We prove that the G?del incompleteness theorem holds for a weak arithmetic T = IΔ0 + Ω2 in the form
where Cons H (T) is an arithmetic formula expressing the consistency of T with respect to the Herbrand notion of provability. Received: 22 September 1997 / Revised version: 27 March 2000 /?Published online: 15 June 2001  相似文献   

20.
  We obtain a new sharp inequality for the local norms of functions x ∈ L ∞, ∞ r (R), namely,
where φ r is the perfect Euler spline, on the segment [a, b] of monotonicity of x for q ≥ 1 and for arbitrary q > 0 in the case where r = 2 or r = 3. As a corollary, we prove the well-known Ligun inequality for periodic functions x ∈ L r , namely,
for q ∈ [0, 1) in the case where r = 2 or r = 3. Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 60, No. 10, pp. 1338–1349, October, 2008.  相似文献   

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