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在△ABC中,以下两不等式成立: ctgA/2+ctgB/2+ctgC/2≥3 3~(1/2), (1) ctg~2A/2+ctg~2B/2+ctg~2C/2≥9, (2) 不等式(2)见文[1]2.43,而(2)可看作(1)的推广,那么对于(1)的更一般形式的指数型的推广是什么呢?下述的命题回答了这个问题。命题在△ABC中,a、b、c是其三边,s是其半周长,即s=1/2(a+b+c),r是其内切圆半径,则 相似文献
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杨士俊 《浙江大学学报(A卷英文版)》2002,3(3):326-331
The aim of this work is to construct a new quadrature formula for Fourier-Chebyshev coef-ficients based on the divided differences of the integrand at points-1, 1 and the zeros of the nth Chebyshev polynomial of the second kind. The interesting thing is that this quadrature rule is closely related to the well-known Gauss-Turn quadrature formula and similar to a recent result of Micchelli and Sharma, extending a particular case due to Micchelli and Rivlin. 相似文献
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杨士俊 《浙江大学学报(A卷英文版)》2002,3(4):455-460
The main purpose of this work is to find for any non-negative measure, the relations between the Gauss-Radau and Gauss-Lobatto
formula and Gauss formulae for the same measure. As applications, the author obtained the explicit Gauss-Radau and Gauss-Lobatto
formulae for the Jacobi weight and the Gori-Micchelli weight.
Project supported by Special Funds for Major State Basic Research Projects (No.G19990328) and Zhejiang Provincial Natural
Science Foundation of China (No. G100002) 相似文献
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文[l〕、「2〕、[3]都谈及了如下一道国际数学竞赛题: 证明:十( 5叮.C仍一二一十侣川 ic昭下一“谓2叮,-月一十C(呢 I(1)即一l+2(既令+娜 I臀)+(c图臀一;考,一0竿+姗臀,一0.所以 本文用韦达定理给出一个非常简易的证明,并不尺易推广到一般情况. 首先,(I)式可变形为c璐下 3汀.5汀!十Cos二二十cos二二二一二. JI乙 。。、号+C‘其次,我们考虑方程 x73汀.5汀l下了十COS一二=气丁, 了I乙对于。=2介+l,无妻l,我们考虑方程 户卜‘十!一0.用同样的方法,则不准得出:以万只一十C璐 乙‘,-l 3万Zk十l十…+c*(2左一1)汀Zk+!一奋+l=0,它的所有根… 相似文献
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给定Jacobi权函数W(α,β),(x)=(1+x)α(1+x)β,(α,β>-1),设xn<xn-1<…<x2<x1为Jacobi多项式Pn(α,β)(x)的零点,yn-1<yn-2<…<y1为其导数的零点,则Gauss型积分公式∫-1f(x)w(α,β)(x)dx的代数精度至少为2n-1. 相似文献
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