共查询到20条相似文献,搜索用时 46 毫秒
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In this paper a singular dissipative boundary value problem with finite transmission conditions is investigated. Using Livšic’s theorem, it is proved that the system of all eigen and associated functions of this problem is complete in the Hilbert space. 相似文献
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In this paper, we first investigate coefficient estimates for bounded polyharmonic mappings in the unit disk D. Then, we obtain two versions of Landau’s theorem for polyharmonic mappings F, and for the mappings of the type L(F), where L is the differential operator of Abdulhadi, Abu Muhanna and Khuri. Examples and numerical estimates are given. 相似文献
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We present a numerical method to invert a general incomplete elliptic integral with respect to its argument and/or amplitude. The method obtains a solution by bisection accelerated by half argument formulas and addition theorems to evaluate the incomplete elliptic integrals and Jacobian elliptic functions required in the process. If faster execution is desirable at the cost of complexity of the algorithm, the sequence of bisection is switched to allow an improvement by using Newton’s method, Halley’s method, or higher-order Schröder methods. In the improvement process, the elliptic integrals and functions are computed by using Maclaurin series expansion and addition theorems based on the values obtained at the end of the bisection. Also, the derivatives of the elliptic integrals and functions are recursively evaluated from their values. By adopting 0.2 as the critical value of the length of the solution interval to shift to the improvement process, we suppress the expected number of bisections to be as low as four on average. The typical number of applications of update formulas in the double precision environment is three for Newton’s method, and two for Halley’s method or higher-order Schröder methods. Whether the improvement process is added or not, our method requires none of the procedures to compute the incomplete elliptic integrals and Jacobian elliptic functions but only those to evaluate the complete elliptic integrals once at the beginning. As a result, it runs fairly quickly in general. For example, when using the improvement process, it is around 2–5 times faster than Newton’s method using Boyd’s starter (Boyd (2012) [25]) in inverting E(φ|m), Legendre’s incomplete elliptic integral of the second kind. 相似文献
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Brooks’ theorem is a fundamental result in the theory of graph coloring. Catlin proved the following strengthening of Brooks’ theorem: Let d be an integer at least 3, and let G be a graph with maximum degree d. If G does not contain Kd+1 as a subgraph, then G has a d-coloring in which one color class has size α(G). Here α(G) denotes the independence number of G. We give a unified proof of Brooks’ theorem and Catlin’s theorem. 相似文献
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J.V. MichalowiczJ.M. Nichols F. BucholtzC.C. Olson 《Statistics & probability letters》2011,81(8):1233-1240
This work generalizes a widely used result derived by L. Isserlis for the expectations of products of jointly Gaussian random variables by extending it to include mixed-Gaussian random variables. 相似文献
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Let a(n,k) be the kth coefficient of the nth cyclotomic polynomial. In part I it was proved that , in the case when m is a prime power. In this paper we show that the result also holds true in the case when m is an arbitrary positive integer. 相似文献
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Matthew Hendtlass 《Applied mathematics and computation》2011,217(13):6185-6191
In [Y. Tanaka, Undecidability of the Uzawa equivalence theorem and LLPO, Appl. Math. Comput. 201 (2008) 378-383] Yasuhito Tanaka showed that Walras’ existence theorem implies the nonconstructive lesser limited principle of omniscience (LLPO); it follows that Walras’ existence theorem does not admit a constructive proof. We give a constructive proof of an approximate version of Walras’ existence theorem from which the full theorem can be recovered with an application of LLPO. We then push Uzawa’s equivalence theorem to the level of approximate solutions, before considering economies with at most one equilibrium. 相似文献
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In this paper, we study suborbital graphs for congruence subgroup Γ0(n) of the modular group Γ to have hyperbolic paths of minimal lengths. It turns out that these graphs give rise to a special continued fraction which is a special case of very famous fraction coming out from Pringsheim’s theorem. 相似文献
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Chun-Gang Ji 《Discrete Mathematics》2008,308(23):5860-5863
Let a(k,n) be the k-th coefficient of the n-th cyclotomic polynomials. In 1987, J. Suzuki proved that . In this paper, we improve this result and prove that for any prime p and any integer l≥1, we have
{a(k,pln)∣n,k∈N}=Z. 相似文献
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Julio C. Ramos Fernández 《Applied mathematics and computation》2010,217(7):3392-3402
In this paper we use Young’s functions to define the Bloch-Orlicz spaces as a generalization of Bloch spaces. We study continuity, boundedness from below and compactness of composition operators on Bloch-Orlicz spaces. 相似文献
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Let A be a set of nonnegative integers. For h≥2, denote by hA the set of all the integers representable by a sum of h elements from A. In this paper, we prove that, if k≥3, and A={a0,a1,…,ak−1} is a finite set of integers such that 0=a0<a1<?<ak−1 and (a1,…,ak−1)=1, then there exist integers c and d and sets C⊆[0,c−2] and D⊆[0,d−2] such that hA=C∪[c,hak−1−d]∪(hak−1−D) for all . The result is optimal. This improves Nathanson’s result: h≥max{1,(k−2)(ak−1−1)ak−1}. 相似文献
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Sufficient conditions are established for the existence of almost periodic solutions for strongly stable nonlinear impulsive differential-difference equations. The investigations are carried out by means of piecewise continuous functions of Lyapunov type and by using Markoff’s sets. We provide an example to demonstrate the effectiveness of our results. 相似文献
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In this article, we discuss a recently introduced function, Ni(x), to which we will refer as the Nield-Kuznetsov function. This function is attractive in the solution of inhomogeneous Airy’s equation. We derive and document some elementary properties of this function and outline its application to Airy’s equation subject to initial conditions. We introduce another function, Ki(x), that arises in connection with Ni(x) when solving Airy’s equation with a variable forcing function. In Appendix A, we derive a number of properties of both Ni(x) and Ki(x), their integral representation, ascending and asymptotic series representations. We develop iterative formulae for computing all derivatives of these functions, and formulae for computing the values of the derivatives at x = 0. An interesting finding is the type of differential equations Ni(x) satisfies. In particular, it poses itself as a solution to Langer’s comparison equation. 相似文献
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Crossing by lines all edges of a line arrangement 总被引:1,自引:0,他引:1
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XiLIFENG 《高校应用数学学报(英文版)》1997,12(4):483-492
For real-valued functions defined on Cantor triadic ,set. a derivative with corresponding formula of Newton-Leihniz‘s type is given In particular, for the self-simltar functions and alter-nately jumping functions defined in this paper, their derivative and exceptional sets are studied ac-curately by using ergodic theory on Е2 and Duffin-Scbaeffer‘s theorem coneerning metric diophan-tine approximation. In addition, Haar basis of L2(Е2) is constructed and Flaar expansion of stan-drd self-similar function is given. 相似文献
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Andreas Sauer 《Mathematische Nachrichten》1997,186(1):243-250
We consider functions f and g which are holomoxphic on closed sectors in C where they admit an asymptotic representation at ∞ in the form of power series in z-1. We give a simple geometrical condition under which the Hadamard product f*g of f and g porsesses again an asymp totic expansion at ∞. It turns out that the asymptotic expansion of f*g is essentially the formal Hsdamd product of the asymptotic expansions of f and g. Our result yields a slight generaliestion of a well known theorem of W. B. Ford. 相似文献
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J. Landes 《International Journal of Approximate Reasoning》2009,51(1):35-55
We prove de Finetti style representation theorems covering the class of all probability functions satisfying spectrum exchangeability in polyadic inductive logic and give an application by characterizing those probability functions satisfying spectrum exchangeability which can be extended to a language with equality whilst still satisfying that property. 相似文献