近几十年来, 因为椭圆方程在几何学、电磁学、弹性力学、流体力学中都有着重要应用, 所以该选题一直都是学者们关注的重点内容.随着研究的不断深入, 带有变指数的偏微分模型走进了学者们的视野, 它主要来源于电流变流体[1], 可以描述非Newton流体的热对流效应[2]以及热动力学中的一些演化现象[3], 非齐次媒质的热与物质交换[4]等, 还可应用于力学[5], 图像学[6]等多方面.与常指数偏微分模型相比它具有更多的优势, 能够更为实际和精准地描述扩散过程.主要是因为指数
$ \begin{equation} \begin{cases} -\mathrm{div}\left(\dfrac{\omega(x)|\nabla u|^{p(x)-2}\nabla u} {(1+|u|)^{\gamma(x)}}\right)+g(x, u) = f, &x\in \Omega, \\ u = 0, &x\in \partial\Omega, \end{cases} \end{equation} $ | (1) |
其中
$ \begin{equation*} |p(x)-p(y)|\leqslant\frac{C}{-\log|x-y|}. \end{equation*} $ |
$ \begin{equation} \sup\limits_{|s|\leqslant k}|g(x, s)| = h_k(x)\in L^1(\Omega). \end{equation} $ | (2) |
另外, 对几乎处处的
$ \begin{equation} g(x, s)\cdot s\geqslant 0. \end{equation} $ | (3) |
(2)
现在, 我们给出问题(1)熵解的定义.
定义0.1 称可测函数
$ \begin{equation} \int_\Omega \frac{\omega(x)|\nabla u|^{p(x)-2}\nabla u}{(1+|u|)^{\gamma(x)}}\cdot\nabla T_k(u-\varphi)\mathrm{d}x+\int_\Omega g(x, u)T_k(u-\varphi)\mathrm{d}x = \int_\Omega fT_k(u-\varphi)\mathrm{d}x. \end{equation} $ | (4) |
本节中, 我们给出加权变指数Sobolev空间的一些相关知识, 更多细节请参见文献[7].
1.1设
$ \begin{equation*} \varsigma_+ = \sup\limits_{x\in\Omega}\varsigma(x), \quad \varsigma_- = \inf\limits_{x\in\Omega}\varsigma(x). \end{equation*} $ |
对任意的
$ \begin{equation*} \int_\Omega\omega(x)|u(x)|^{p(x)}\mathrm{d}x<\infty, \end{equation*} $ |
并赋予范数
$ \begin{equation*} \|u\|_{L^{p(x)}(\Omega, \omega)} = \inf\bigg\{\lambda>0:\int_\Omega\omega(x)\left|\frac{u(x)}{\lambda}\right|^{p(x)}\leqslant1\bigg\}. \end{equation*} $ |
对任意的正整数
$ \begin{equation*} W^{k, p(x)}(\Omega, \omega) = \{u\in L^{p(x)}(\Omega, \omega):D^\alpha u\in{L^{p(x)}(\Omega, \omega)}, \ |\alpha|\leqslant k\}, \end{equation*} $ |
并赋予范数
$ \begin{equation*} \|u\|_{W^{k, p(x)}(\Omega, \omega)} = \sum\limits_{|\alpha|\leqslant k}\|D^\alpha u\|_{L^{p(x)}(\Omega, \omega)}. \end{equation*} $ |
如果我们记
$ \begin{equation*} \rho(u) = \int_\Omega\omega(x)|u|^{p(x)}\mathrm{d}x, \quad \forall\ u\in L^{p(x)}(\Omega, \omega), \end{equation*} $ |
那么
$ \begin{equation*} \min\{\|u\|_{L^{p(x)}(\Omega, \omega)}^{p^-}, \|u\|_{L^{p(x)}(\Omega, \omega)}^ {p^+}\} \leqslant \rho(u)\leqslant \max\{\|u\|_{L^{p(x)}(\Omega, \omega)}^{p^-}, \|u\|_{L^{p(x)}(\Omega, \omega)}^{p^+}\}. \end{equation*} $ |
对任意的
$ \begin{equation*} p_s(x): = \frac{p(x)s(x)}{1+s(x)}<p(x), \end{equation*} $ |
其中
$ \begin{equation*} p_s^*(x): = \begin{cases} \dfrac{p(x)s(x)N}{(s(x)+1)N-p(x)s(x)}, & N>p_s(x), \\ +\infty, & N\leqslant p_s(x). \end{cases} \end{equation*} $ |
设
$ \begin{equation*} W^{1, p(x)}(\Omega, \omega)\hookrightarrow L^{r(x)}(\Omega). \end{equation*} $ |
当
设
$ \begin{equation*} \|u\|_{L^{p(x)}(\Omega)}\leqslant C\|\nabla u\|_{L^{p(x)}(\Omega, \omega)} \end{equation*} $ |
成立, 其中常数
一般情形下, 对于在
$ \begin{equation*} T_k(s) = \max(-k, \min(k, s)) = \begin{cases} s, &\text{若}\ |s|<k, \\ k, &\text{若}\ s\geqslant k, \\ -k, &\text{若}\ s\leqslant -k. \end{cases} \end{equation*} $ |
鉴于其重要性以及为了直观起见, 我们给出它的简图.
定理2.1 假设
第1步 逼近问题及先验估计.为了证明方程(1)解的存在性结果, 我们建立方程(1)的逼近问题
$ \begin{equation} \begin{cases} -\mathrm{div}\left(\dfrac{\omega(x)|\nabla u_n|^{p(x)-2}\nabla u_n}{(1+|T_n(u_n)|)^{\gamma(x)}}\right)+g_n(x, u_n) = f_n, &x\in \Omega, \\ u_n = 0, &x\in \partial\Omega. \end{cases} \end{equation} $ | (5) |
这里,
$ \begin{equation} \int_\Omega\frac{\omega(x)|\nabla u_n|^{p(x)-2}\nabla u_n}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla v\mathrm{d}x+\int_\Omega g_n(x, u_n)v\mathrm{d}x = \int_\Omega f_nv\mathrm{d}x. \end{equation} $ | (6) |
接下来, 我们对逼近解序列
$ \begin{equation} \int_\Omega\frac{\omega(x)|\nabla u_n|^{p(x)-2}\nabla u_n}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_k(u_n)\mathrm{d}x+\int_\Omega g_n(x, u_n)T_k(u_n)\mathrm{d}x = \int_\Omega f_nT_k(u_n)\mathrm{d}x. \end{equation} $ | (7) |
现在要估计式(4), 注意到
$ \begin{equation*} \int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)}}{(1+|T_n(u_n)|)^{\gamma(x)}}\mathrm{d}x\leqslant k\|f\|_{L^1(\Omega)}. \end{equation*} $ |
如果选取
$ \begin{equation} \int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)}}{k(1+k)^{\gamma(x)}}\mathrm{d}x\leqslant \|f\|_{L^1(\Omega)}. \end{equation} $ | (8) |
因此, 对所有
$ \begin{equation} \int_\Omega\omega(x)|\nabla T_k(u_n)|^{p(x)}\mathrm{d}x\leqslant k(1+k)^{\gamma^+}\|f\|_{L^1(\Omega)}. \end{equation} $ | (9) |
注意到式(8), 若
$ \begin{equation*} \int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)}}{k(k+k)^{\gamma(x)}}\mathrm{d}x\leqslant \|f\|_{L^1(\Omega)}. \end{equation*} $ |
这样, 对于
$ \begin{equation} \int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)}}{k^{\gamma^++1}}\mathrm{d}x\leqslant C\int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)}}{k^{\gamma(x)+1}}\mathrm{d}x\leqslant C\|f\|_{L^1(\Omega)}, \end{equation} $ | (10) |
其中
$ \begin{equation*} W^{1, p(x)}_0(\Omega, \omega)\hookrightarrow L^{p^*_s(x)} (\Omega)\hookrightarrow L^{(p^*_s)^-}(\Omega). \end{equation*} $ |
其中
$ \begin{align*} (p^*_s)^- = \dfrac{p^-s^-N}{(s^-+1)N-p^-s^-}. \end{align*} $ |
注意到式(10), 并对
$ \begin{align*} \|T_k(u_n)\|_{L^{(p^*_s)^-}(\Omega, \omega)} &\leqslant C\|\nabla T_k(u_n)\|_{L^{p(x)}(\Omega, \omega)}\\ &\leqslant C\left(\int_\Omega\omega(x)|\nabla T_k(u_n)|^{p(x)}\mathrm{d}x\right)^{\frac{1}{\beta}}\\ &\leqslant C\left(\|f\|_{L^1(\Omega)}k^{\gamma^++1}\right)^{\frac{1}{\beta}}, \end{align*} $ |
其中
$ \begin{equation*} \beta = \begin{cases} p^-, &\text{若}\ \|\nabla T_k(u_n)\|_{L^{p(x)}(\Omega, \omega)} \geqslant1, \\ p^+, &\text{若}\ \|\nabla T_k(u_n)\|_{L^{p(x)}(\Omega, \omega)}\leqslant1. \end{cases} \end{equation*} $ |
我们将
$ \begin{align*} \mathrm{meas}\{|u_n|\geqslant k\}&\leqslant\left(\frac{\|T_k(u_n)\|_{L^{(p^*_s)^-}(\Omega, \omega)}}{k}\right)^{(p^*_s)^-}\\ &\leqslant\frac{C\|f\|_{L^1(\Omega)}^{\frac{(p^*_s)^-}{\beta}}}{k^{(p^*_s)^-(1-\frac{\gamma^++1}{\beta})}} \leqslant \frac{C(\|f\|_{L^1(\Omega)}+1)^{\frac{(p^*_s)^-}{p^-}}}{k^{(p^*_s)^-(1-\frac{\gamma^++1}{p^-})}}, \end{align*} $ |
其中
$ \begin{equation} \lim\limits_{k\rightarrow\infty}\mathrm{meas}\{|u_n|>k\} = 0, \ \text{关于}\ n\ \text{一致收敛}. \end{equation} $ | (11) |
第2步
$ \begin{equation*} \{|u_n-u_m|>\epsilon\}\subset\{|u_n|>k\}\cup\{|u_m|>k\}\cup\{|T_k(u_n)-T_k(u_m)|>\epsilon\}, \end{equation*} $ |
也就是说
$ \begin{equation*} \mathrm{meas}\{|u_n-u_m|>\epsilon\}\leqslant \mathrm{meas}\{|u_n|>k\}+\mathrm{meas}\{|u_m|>k\}+\mathrm{meas}\{|T_k(u_n)-T_k(u_m)|>\epsilon\}. \end{equation*} $ |
对每一个固定的
$ \begin{equation} \mathrm{meas}\{|u_n-u_m|>\epsilon\}\leqslant \frac{\sigma}{2} +\mathrm{meas}\{|T_{\widehat{k}}(u_n)-T_{\widehat{k}}(u_m)|>\epsilon\}. \end{equation} $ | (12) |
注意到式(9), 我们可知
$ \begin{equation*} \lim\limits_{n, m\rightarrow\infty}\mathrm{meas}\{|u_n-u_m|>\epsilon\} = 0, \end{equation*} $ |
这说明
$ \begin{equation} u_n\rightarrow u, \ \text{在}\ \Omega\ \text{上几乎处处收敛}. \end{equation} $ | (13) |
结合式(9), 我们可选取
$ \begin{equation} T_k(u_n)\rightarrow T_k(u), \ \text{于}\ W^{1, p(x)}_0(\Omega, \omega)\ \text{中弱收敛}. \end{equation} $ | (14) |
第3步
$ \begin{equation} \int_{\Omega}\frac{\omega(x)\rho'_i(u_n)|\nabla u_n|^{p(x)}}{(1+|T_n(u_n)|)^{\gamma(x)}}\mathrm{d}x+\int_{\Omega} g_n(x, u_n)\rho_i(u_n)\mathrm{d}x = \int_{\Omega}f_n\rho_i(u_n)\mathrm{d}x. \end{equation} $ | (15) |
由于式(15)左端第一项为非负项, 我们去掉非负项, 可得
$ \begin{equation*} \int_{\Omega} g_n(x, u_n)\rho_i(u_n)\mathrm{d}x\leqslant \int_{\Omega}f_n\rho_i(u_n)\mathrm{d}x. \end{equation*} $ |
结合式(2), 并运用Lebesgue控制收敛定理, 取
$ \begin{equation} \int_{\{|u_n|> k\}}|g_n(x, u_n)|\mathrm{d}x\leqslant \int_{\{|u_n|> k\}}|f_n|\mathrm{d}x. \end{equation} $ | (16) |
对任意给定的
$ \begin{equation*} \int_{\{|u_n|>k_\epsilon\}}|f_n|\mathrm{d}x<\epsilon. \end{equation*} $ |
对
$ \begin{align*} \int_E |g_n(x, u_n)|\mathrm{d}x& = \int_{E\cap\{|u_n|\leqslant k_\epsilon\}} |g_n(x, u_n)|\mathrm{d}x +\int_{E\cap\{|u_n|> k_\epsilon\}} |g_n(x, u_n)|\mathrm{d}x\\ &\leqslant\int_{\{|u_n|>k_\epsilon\}}|f_n|\mathrm{d}x+\int_E h_{k_\epsilon}(x)\mathrm{d}x\\ &\leqslant\epsilon+\int_E h_{k_\epsilon}(x)\mathrm{d}x\leqslant2\epsilon. \end{align*} $ |
于是,
$ \begin{equation} g_n(x, u_n)\to g(x, u), \ \text{于}\ L^1(\Omega)\ \text{中强收敛}. \end{equation} $ | (17) |
第4步
$ \begin{align*} &\underbrace{\int_\Omega\frac{\omega(x)|\nabla u_n|^{p(x)-2} \nabla u_n}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x}_{\mathrm{(A)}}\\ &+\underbrace{\int_{\Omega} g_n(x, u_n)T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x}_{\mathrm{(B)}}\\ = \, &\underbrace{\int_{\Omega}f_n T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x}_{\mathrm{(C)}}. \end{align*} $ |
为了方便起见, 我们记
$ \begin{equation*} \lim\limits_{h\rightarrow \infty} \lim\limits_{n\rightarrow \infty}\varepsilon_{n, h} = 0. \end{equation*} $ |
类似地,
$ \begin{equation} \int_{\Omega} g_n(x, u_n)T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x = \varepsilon_{n, h}, \end{equation} $ | (18) |
$ \begin{equation} \int_{\Omega}f_n T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x = \varepsilon_{n, h}. \end{equation} $ | (19) |
于是, 由式(18)、式(19)可得
$ \begin{equation*} \int_{\Omega}(f_n-g_n(x, u_n)) T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x = \varepsilon_{n, h}. \end{equation*} $ |
关于(A), 我们设
$ \begin{align*} \mathrm{(A)} = &\int_{\{|u_n|<k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x\\ &+\int_{\{|u_n|\geqslant k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_{2k}[u_n-T_h(u_n)+T_k(u_n)-T_k(u)]\mathrm{d}x. \end{align*} $ |
由于在集合
$ \begin{align*} \mathrm{(A)} = &\int_\Omega\frac{\omega(x)|\nabla T_k(u_n)|^{p(x)-2} \nabla T_k(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla [T_k(u_n)-T_k(u)]\mathrm{d}x\\ &+\int_{\{|u_n|\geqslant k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla [u_n-T_h(u_n)]\mathrm{d}x\\ &-\int_{\{|u_n|\geqslant k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_k(u)\mathrm{d}x. \end{align*} $ |
上式右端第二项为非负项, 去掉非负项并对右端第一项进行拆分后可得
$ \begin{align*} \varepsilon_{n, h}\geqslant&\int_\Omega\frac{\omega(x)[|\nabla T_k(u_n)|^{p(x)-2} \nabla T_k(u_n)-|\nabla T_k(u)|^{p(x)-2} \nabla T_k(u)]}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla [T_k(u_n)-T_k(u)]\mathrm{d}x\\ &+\int_\Omega\frac{\omega(x)|\nabla T_k(u)|^{p(x)-2} \nabla T_k(u)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla [T_k(u_n)-T_k(u)]\mathrm{d}x\\ &-\int_{\{|u_n|\geqslant k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_k(u)\mathrm{d}x\\ = &I_n+J_n-K_n. \end{align*} $ |
上式后两项在
$ \begin{equation*} \lim\limits_{n\rightarrow \infty} J_n = \lim\limits_{n\rightarrow \infty}\int_\Omega\frac{\omega(x)|\nabla T_k(u)|^{p(x)-2} \nabla T_k(u)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla [T_k(u_n)-T_k(u)]\mathrm{d}x = 0. \end{equation*} $ |
关于
$ \begin{equation*} K_n = \int_\Omega\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)\cdot\nabla T_k(u)\chi_{\{|u_n|\geqslant k\}}}{(1+|T_n(u_n)|)^{\gamma(x)}}\mathrm{d}x. \end{equation*} $ |
当
$ \begin{equation*} \lim\limits_{n\rightarrow \infty} K_n = \lim\limits_{n\rightarrow \infty}\int_{\{|u_n|\geqslant k\}}\frac{\omega(x)|\nabla T_M(u_n)|^{p(x)-2} \nabla T_M(u_n)}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_k(u)\mathrm{d}x = 0. \end{equation*} $ |
综上, 对
$ \begin{align*} \varepsilon(n, h)\geqslant I_n\geqslant&\frac{1}{(1+k)^{\gamma^+}} \int_\Omega\omega(x)[|\nabla T_k(u_n)|^{p(x)-2} \nabla T_k(u_n)-|\nabla T_k(u)|^{p(x)-2} \nabla T_k(u)]\\ &\; \; \; \; \times \nabla [T_k(u_n)-T_k(u)]\mathrm{d}x\geqslant 0. \end{align*} $ |
即当
$ \begin{equation} \nabla T_k(u_n)\rightarrow \nabla T_k(u), \ \text{于} (L^{p(x)}(\Omega, \omega))^N\text{中强收敛}. \end{equation} $ | (20) |
第5步
$ \begin{equation} \int_\Omega\frac{\omega(x)|\nabla u_n|^{p(x)-2}\nabla u_n}{(1+|T_n(u_n)|)^{\gamma(x)}}\cdot\nabla T_k(u_n-\phi)\mathrm{d}x+\int_\Omega g(x, u_n)T_k(u_n-\phi)\mathrm{d}x = \int_\Omega f_nT_k(u_n-\phi)\mathrm{d}x. \end{equation} $ | (21) |
对于上式的后两项, 结合式(17), 且
$ \begin{equation*} \int_\Omega g(x, u_n)T_k(u_n-\phi)\mathrm{d}x\rightarrow\int_\Omega g(x, u)T_k(u-\phi)\mathrm{d}x, \end{equation*} $ |
$ \begin{equation*} \int_\Omega f_nT_k(u_n-\phi)\mathrm{d}x\rightarrow\int_\Omega fT_k(u-\phi)\mathrm{d}x. \end{equation*} $ |
对于式(21)左端第一项, 设
$ \begin{equation*} T_k(u_n-\phi)\rightarrow T_k(u-\phi), \ \text{在}\ \Omega\ \text{上几乎处处收敛}. \end{equation*} $ |
另外, 注意到式(9), 有
$ \begin{align*} \int_\Omega\omega(x)|\nabla T_k(u_n-\phi)|^{p(x)}\mathrm{d}x& = \int_{\{|u_n-\phi|<k\}}\omega(x)|\nabla(u_n-\phi)|^{p(x)}\mathrm{d}x\\ &\leqslant\int_{\{|u_n|<L\}}\omega(x)|\nabla(u_n-\phi)|^{p(x)}\mathrm{d}x\\ &\leqslant 2^{p^+}\left(\int_\Omega\omega(x)|\nabla T_L(u_n)|^{p(x)}\mathrm{d}x+\int_\Omega\omega(x)|\nabla \phi|^{p(x)}\mathrm{d}x\right)\\ &\leqslant C \;(\text{与}\ n\ \text{无关}). \end{align*} $ |
因此,
$ \begin{equation} \int_\Omega T_k(u_n-\phi)\mathrm{d}x\rightarrow\int_\Omega T_k(u-\phi)\mathrm{d}x, \ \text{于}\ W_0^{1, p(x)}(\Omega, \omega)\ \text{中弱收敛}. \end{equation} $ | (22) |
设
$ \begin{align*} &\int_\Omega \frac{\omega(x)|\nabla u_n|^{p(x)-2}\nabla u_n\cdot\nabla T_k(u_n-\phi)}{(1+|T_n(u_n)|)^{\gamma(x)}}\mathrm{d}x\\ & = \int_\Omega \frac{\omega(x)|\nabla T_L(u_n)|^{p(x)-2}\nabla T_L(u_n)\cdot\nabla T_k(u_n-\phi)}{(1+| T_L(u_n)|)^{\gamma(x)}}\mathrm{d}x\\ &\rightarrow\int_\Omega \frac{\omega(x)|\nabla T_L(u)|^{p(x)-2}\nabla T_L(u)\cdot\nabla T_k(u-\phi)}{(1+| T_L(u)|)^{\gamma(x)}}\mathrm{d}x\\ & = \int_\Omega \frac{\omega(x)|\nabla u|^{p(x)-2}\nabla u\cdot\nabla T_k(u-\phi)}{(1+| u|)^{\gamma(x)}}\mathrm{d}x. \end{align*} $ |
这样我们就证明了
[1] |
RŮŽIČKA M. Electrorheological fluids:Modeling and Mathematical Theory[M]. Berlin: Springer-Verlag, 2000.
|
[2] |
ANTONTSEV S N, DÍAZ J I, DE OLIVEIRA H B. Thermal effects without phase changing[J]. Progress in Nonlinear Differential Equations and Their Application, 2015, 61: 1-14. |
[3] |
ELEUTERI M, HABERMANN J. Calderón-Zygmund type estimates for a class of obstacle problems with p(x) growth[J]. J Math Anal Appl, 2010, 372: 140-161. DOI:10.1016/j.jmaa.2010.05.072 |
[4] |
RODRIGUES J F, SANCHÓN M, URBANO J M. The obstacle problem for nonlinear elliptic equations with variable growth and L1-data[J]. Monatsh Math, 2008, 154: 303-322. DOI:10.1007/s00605-008-0550-4 |
[5] |
BLANCHARD D, GUIBÉ O. Existence of a solution for a nonlinear system in thermoviscoelasticity[J]. Adv Differential Equations, 2000, 5: 1221-1252. |
[6] |
HARJULEHTO P, HÄSTÖ P, LATVALA V, et al. Critical variable exponent functionals in image restoration[J]. Appl Math Lett, 2013, 26: 56-60. DOI:10.1016/j.aml.2012.03.032 |
[7] |
GOL'DSHTEIN V, UKHLOV A. Weighted Sobolev spaces and embedding theorems[J]. Trans Amer Math Soc, 2009, 361: 3829-3850. DOI:10.1090/S0002-9947-09-04615-7 |
[8] |
BLANCHARD D, MURAT F, REDWANE H. Existence and uniqueness of a renormalized solution for a fairly general class of nonlinear parabolic problems[J]. J Differential Equations, 2001, 177(2): 331-374. |
[9] |
DAI L L, GAO W J, LI Z Q. Existence of solutions for degenerate elliptic problems in weighted Sobolev space[J]. Journal of Function Spaces, 2015, 2015: 1-9. |
[10] |
ZHANG C, ZHOU S. Entropy and renormalized solutions for the p(x)-Laplacian equation with measure data[J]. Bull Aust Math Soc, 2010, 82: 459-479. DOI:10.1017/S0004972710000432 |
[11] |
代丽丽, 曹春玲. 一类具权函数的退化椭圆方程解的性质[J]. 吉林大学学报(理学版), 2018, 56: 589-593. |
[12] |
LIONS J L. Quelques méthodes de résolution des problemes aux limites non linéaires[M]. Paris: Dunod, 1969.
|