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H表示一个正整数N的集合,使对任意的正整数q,同余方程a+b~2≡N(mod q)在模q的既约剩余系中有解a;b.E(x)表示N≤x,N∈H,但不能表成p_1+p_2~2=N的数的个数,其中p_1,p_2个表示素数,则E(x)<相似文献
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本文证明了最多有O(N13/30+ε)个例外之外,所有的正的奇整数n≤N,n≡0或1(mod 3)能表示成一个素数和两个素数的平方和. 相似文献
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表偶数为素数及殆素数之和 总被引:3,自引:0,他引:3
<正> §1 設N为大偶数,V(m)为m的素因子的个数,在1948年A.Renyi証明了N=a+b,这里,V(a)=1,V(b)≤K,K为一絕对常数.在广义黎曼猜測下王元証明了K≤3.本文証明了K≤5,即証明了下面的定理: 定理.任一充分大的偶数N可表成p+P之和,其中p为素数,P为一个不超过5个 相似文献
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在浩瀚元垠数的天庭 ,有一种神奇的伪素数 ,它像一块磁石 ,紧紧吸引着数论专家的心灵 .1 费马小定理引发出的奇异法国业余数学家费马 (Fermat) 1 6 4 0年 6月给本国神甫数学家梅森 (M .Mersenne ,1 5 88- 1 6 4 8)的一封信提出一个命题 :若n是素数 ,则 2 n- 2可被 2n除尽 .同年 1 0月 1 8日给本国数学家德贝西(B .F .deBessie,1 6 0 5 - 1 6 75 )的信中又说 ,他已证明了一个更广的命题 :若p是一个素数 ,且a不能被p整除 ,则ap- 1 - 1能被p整除 (等价的说法是ap-a能被素数p整除 ) .后人称此为费马小定… 相似文献
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We study the asymptotic behavior at large time of a solution to a system of nonlinear integro-differential equations which arises in mathematical modeling of diffusion of a magnetic field into a substance. We establish the corresponding stabilization rate. 相似文献
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E. M. Perper 《Moscow University Mathematics Bulletin》2018,73(5):171-175
The paper considers the construction of formulas describing relations between entities from a Russian sentence. We describe rules which help constructing such formulas from a syntax graph. 相似文献
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Richard J. Gardner Paolo Gronchi Thorsten Theobald 《Discrete and Computational Geometry》2012,48(3):749-765
The following problem, arising from medical imaging, is addressed: Suppose that T is a known tetrahedron in ?3 with centroid at the origin. Also known is the orthogonal projection U of the vertices of the image ?T of T under an unknown rotation ? about the origin. Under what circumstances can ? be determined from T and U? 相似文献
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Symmetry-based solution of a model for a combination of a risky investment and a riskless investment
Benth and Karlsen [F.E. Benth, K.H. Karlsen, A note on Merton's portfolio selection problem for the Schwartz mean-reversion model, Stoch. Anal. Appl. 23 (2005) 687-704] treated a problem of the optimisation of the selection of a portfolio based upon the Schwartz mean-reversion model. The resulting Hamilton-Jacobi-Bellman equation in 1+2 dimensions is quite nonlinear. The solution obtained by Benth and Karlsen was very ingenious. We provide a solution of the problem based on the application of the Lie theory of continuous groups to the partial differential equation and its associated boundary and terminal conditions. 相似文献
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We consider the Hamiltonian of a system of four arbitrary quantum particles with two-particle contact (noncompact) interaction potentials on a three-dimensional lattice perturbed by three-particle contact potentials. We describe the location of the essential spectrum of the Schrödinger operator corresponding to a four-particle system. 相似文献