共查询到20条相似文献,搜索用时 78 毫秒
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文[1]介绍了关于2n-1cosnθ的降次公式及其证明,作为其推广,本文进而导出了关于2n-1nj=1cosθj与2n-1nj=1sinθj的如下降次公式(即“n次积化和差公式”):定理 记C(0)n(θj)=cos(θ1 … θn),S(0)n(θj)=sin(θ1 … θn);C(k)n(θj... 相似文献
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山东省高师物理专业一九九七年专科升本科高等数学试题中有这样一道题目 :计算二重积分 Dyexydxdy,其中 D是由直线 x=1 ,x=2 ,y=2和曲线 xy=1所围成的闭区域 .我们先看试题的解答 .解法一 若根据被积函数的特点选择积分次序 ,应先对 x后对 y积分 ,区域 D就必须被分成D1和 D2 两块 ,其中D1:1y ≤ x≤ 212 ≤ y≤ 1, D2 :1≤ x≤ 21≤ y≤ 2 .于是 Dyexydxdy=∫112dy∫21yyexydx ∫21dy∫21yexydx =∫112(e2 y -e) dy ∫21(e2 y -ey) dy=(12 e2 y -ey)112 (12 e2 y -ey)21=12 e4 -e2 . 解法二 若根据区域 D的形状选择积分… 相似文献
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借助实例说明如何通过选择合适的变量代换同时简化二重积分的被积函数和积分区域,或只是简化其中之一,以达到简化二重积分计算的目的. 相似文献
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三角恒等变换是指利用同角公式、诱导公式、两角和与差的三角函数公式、和差化积与积化和差公式、万能公式等对三角式做各种有目的的变形.变形中主要涉及角、函数、名、结构、运算方式的变换,其技巧常有差异分析、化异为同、辅助角、三角代换、和差配凑、幂指变换等. 相似文献
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通过利用分部积分与二次积分交换积分顺序这两种方法,讨论了被积函数中出现sinx/x,sinx^2,e^-x2,e^y/x,sin^y/x等函数时二重积分的计算 相似文献
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B.G. Pachpatte 《Journal of Mathematical Analysis and Applications》2002,267(2):454-459
We establish two new inequalities of Grüss type involving functions of two independent variables. The analysis used in the proofs is elementary and our results provide new estimates on inequalities of this type. 相似文献
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A general method is described for the numerical evaluation ofintegrals of the form
where, in a typical case, (x, y) is a lengthy polynomial ofdegree 10 in (x, y) and A is the region common to three overlappingcircles, although the method is in no way restricted to suchcases. Illustrative numerical examples are given. 相似文献
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《Acta Appl Math》2010,110(1):477-497
In this paper we first derive an Ostrowski type inequality on time scales for double integrals via ΔΔ-integral which unify corresponding continuous and discrete versions. We then replace the ΔΔ-integral by the ∇ ∇-, Δ∇-, and ∇Δ-integrals and get completely analogous results. 相似文献
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We prove the Ostrowski type inequality for double integrals on time scales and thus unify corresponding continuous and discrete versions from the literature. We also apply the Ostrowski inequality for double integrals to the quantum time scales. 相似文献
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引进偏Bochner积分的概念.证明了在不可分清形下,偏Bochner积分与Bochner积分有本质的差异.作为应用,通过向量测度空间用价Bochner积分给出了Radon-Nikodym性质的一个刻划. 相似文献
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Double operator integrals are a convenient tool in many problems
arising in the theory of self-adjoint operators, especially in the perturbation
theory. They allow to give a precise meaning to operations with functions
of two ordered operator-valued non-commuting arguments. In a different language,
the theory of double operator integrals turns into the problem of scalarvalued
multipliers for operator-valued kernels of integral operators.The paper gives a short survey of the main ideas, technical tools and
results of the theory. Proofs are given only in the rare occasions, usually they
are replaced by references to the original papers. Various applications are
discussed. 相似文献
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Hardy-Hilbert重级数不等式的推广与改进 总被引:4,自引:1,他引:4
洪勇 《数学的实践与认识》2002,32(5):849-854
本文将著名的 Hardy-Hilbert重级数不等式∑∞m=1 ∑∞n=1ambnm + n≤ πsin(π/p) ∑∞n=1apn1p ∑∞n=1bqn1q∑∞m=1 ∑∞n=1anm + np ≤ πsin(π/p)p∑∞n=1apn进行了带参数形式的推广 ,同时改进了这些不等式 相似文献
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