排序方式: 共有47条查询结果,搜索用时 31 毫秒
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LIU Ke-ying XU Shao-xian LIU An-ping 《数学季刊》2005,20(4):342-349
This paper deals with the oscillatory properties of a class of nonlinear neutral parabolic partial differential equations with several delays. Sufficient criteria for the equation to be oscillatory are obtained by making use of some results of first-order functional differential inequalities. These results fully reveal the essential difference between this type and that without delays. 相似文献
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By using the cone theory and the monotone succession skills,it is studied the existence uniqueness of fixed point for a class of increasing operators without continuity and compactness and concave or convex conditions in Banach spaces.The results presented here improve and generalize some corresponding results for increasing operator. 相似文献
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研究半导体方程混合初边值解的整体性质,应用Stampacchia的最大模估计方法,对问题解的上下界分别作出估计. 相似文献
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一类半线性椭圆方程解的存在性 总被引:1,自引:1,他引:0
本文研究了一类具有临界增长的半线性椭圆型方程.采用最近A.Ambrosetti所提出的扰动方法研究这类问题,得到这类问题的解的存在性.与通常所用的临界点理论方法相比较,本文解的存在性在较弱条件下可得. 相似文献
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本文中,我们给出了丢番图方程的解x,y,z,w的上界,其中p,q是给定的互素的正整数,a,b,c,d是给定的适合abed≠0的整数,此外,我们将指出在具体情形下如何把上界降低到方程允许的实际的解.最后,我们将用这个方法来解方程19.5x·17y=12.5z+41.17w+14, 5. 3x· 13y + 20= 7. 3z + 14. 13w和 13· 2x+ 5· 3y= 25. 2z+ 11. 3w. 相似文献
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微分方程的指数稳定性 总被引:1,自引:0,他引:1
比较系统地研究了It方程解的指数稳定性.给出了随机指数稳定性、指数P-稳定性、几乎必然指数稳定性的比较准则,这些比较准则推广了Nevel’son和Has’minskiǐ的相应结果. 相似文献
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CHENG Yan-Fu DAI Tong-Qing 《理论物理通讯》2007,48(3):431-434
We propose a new exactly solvable potential which is Formed by modified Kratzer potential plus a new ring-shaped potential η cot^2 θ/r^2 The solutions of the Dirac equation with equal scalar and vector ring-shaped modified Kratzer potential are found by using the Nikiforov-Uvarov method. The nonrelativistic limit of the energy spectrum has been discussed. 相似文献
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研究了实Banach空间中多值与单值增生算子方程f∈z Tx解的具误差的Mann和Ishikawa迭代逼近问题,算子可以不满足Lipschitz条件.且减弱值域的有界性。 相似文献