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浙江大学学报(理学版)  2022, Vol. 49 Issue (6): 670-675    DOI: 10.3785/j.issn.1008-9497.2022.06.004
数学与计算机科学     
格林函数变号时二阶离散周期边值问题正解的存在性
胡文丰1,王晶晶2()
1.宁波职业技术学院 公共教学部,浙江 宁波 315800
2.西北师范大学 数学与统计学院,甘肃 兰州 730070
Existence of positive solutions for second order discrete periodic boundary value problems with sign-changing Green′s function
Wenfeng HU1,Jingjing WANG2()
1.Department of Public Course Teaching,Ningbo Polytechnic,Ningbo 315800,Zhejiang Province,China
2.College of Mathematics and Statistics,Northwest Normal University,Lanzhou 730070,China
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摘要:

运用锥上的不动点指数理论,讨论了格林函数变号时的二阶离散周期边值问题 Δ2u(t-1)+k2u(t)=λb(t)f(u(t)),????t[1,?n]Z,u(0)=u(n),????Δu(0)=Δu(n)?λb(t)1时,该问题存在正解;当b[1?n]ZR+时,该问题不存在正解,其中fC(R+?R+)k为满足tanθ=k4-k22-k2的常数,λ为参数,θ03π2nR+=[0?)

关键词: 周期边值问题正解变号格林函数不动点指数    
Abstract:

In this paper, the second order discrete periodic boundary value problem

Δ2u(t-1)+k2u(t)=λb(t)f(u(t)),????t[1,?n]Z,u(0)=u(n),????Δu(0)=Δu(n)?

is studied by using the fixed point index theory on the cone. Firstly,the existence of the positive solution is proved when λb(t)1;Secondly, we show the nonexistence of the positive solution of this problem when b[1?n]ZR+,where is fC(R+?R+),k is a constant satisfying tanθ=k4-k22-k2,λ is a parameter and θ03π2n,R+=[0?).

Key words: periodic boundary value problem    positive solution    sign-changing Green's function    fixed point index
收稿日期: 2021-09-13 出版日期: 2022-11-23
CLC:  O 175.8  
基金资助: 宁波职业技术学院校级课题(NZ22013)
通讯作者: 王晶晶     E-mail: WJJ950712@163.com
作者简介: 胡文丰(1994—),ORCID: https://orcid.org/0000-0003-3518-4172,男,硕士,助教,主要从事计算数学研究.
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引用本文:

胡文丰,王晶晶. 格林函数变号时二阶离散周期边值问题正解的存在性[J]. 浙江大学学报(理学版), 2022, 49(6): 670-675.

Wenfeng HU,Jingjing WANG. Existence of positive solutions for second order discrete periodic boundary value problems with sign-changing Green′s function. Journal of Zhejiang University (Science Edition), 2022, 49(6): 670-675.

链接本文:

https://www.zjujournals.com/sci/CN/10.3785/j.issn.1008-9497.2022.06.004        https://www.zjujournals.com/sci/CN/Y2022/V49/I6/670

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