Positivity ( IF 0.8 ) Pub Date : 2021-03-01 , DOI: 10.1007/s11117-021-00820-x D. D. Hai , A. Muthunayake , R. Shivaji
We study positive solutions to the two-point boundary value problem:
$$\begin{aligned} \begin{matrix} -u''=\lambda h(t) f(u)~;~(0,1) \\ u(0)=0\\ u'(1)+c(u(1))u(1)=0,\end{matrix} \end{aligned}$$where \(\lambda >0\) is a parameter, \(h \in C^1((0,1],(0,\infty ))\) is a decreasing function, \(f \in C^1((0,\infty ),\mathbb {R}) \) is an increasing concave function such that \(\lim \limits _{s \rightarrow \infty }f(s)=\infty \), \(\lim \limits _{s \rightarrow \infty }\frac{f(s)}{s}=0\), \(\lim \limits _{s \rightarrow 0^+}f(s)=-\infty \) (infinite semipositone) and \(c \in C([0,\infty ),(0,\infty ))\) is an increasing function. For classes of such h and f, we establish the uniqueness of positive solutions for \(\lambda \gg 1\).
中文翻译:
一类具有非线性边界条件的无限半正问题的唯一性结果
我们研究两点边值问题的正解:
$$ \ begin {aligned} \ begin {matrix} -u''= \ lambda h(t)f(u)〜;〜(0,1)\\ u(0)= 0 \\ u'(1) + c(u(1))u(1)= 0,\ end {matrix} \ end {aligned} $$其中\(\ lambda> 0 \)是一个参数,\(h \ in C ^ 1((0,1],(0,\ infty))\)是一个递减函数,\(f \ in C ^ 1 (((0,\ infty),\ mathbb {R})\)是一个递增的凹函数,使得\(\ lim \ limits _ {s \ rightarrow \ infty} f(s)= \ infty \),\(\ lim \ limits _ {s \ rightarrow \ infty} \ frac {f}} {s} = 0 \),\(\ lim \ limits _ {s \ rightarrow 0 ^ +} f(s)=-\ infty \)(无限半正整数)和\(c \ in C([0,\ infty),(0,\ infty))\)是一个递增函数。对于此类h和f的类,我们建立了\(\ lambda \ gg 1 \)的正解的唯一性。