AI 中文总结
本文针对含凸密度的非一致椭圆方程,在低维条件下研究其整体解的Liouville性质,明确了有界解必为常数的判定条件。
AI 中文摘要
我们考虑方程div(∇f(∇u))=0的整体解u:ℝⁿ→ℝ,其中n≥2,凸密度f:ℝⁿ→ℝ的例子为f(∇u)=∑ᵢ₌₁ⁿ|∂ᵢu|^pᵢ,指数pᵢ≥2,包括Giaquinta的例子,其取p₁=…=pₙ₋₁=2、pₙ=4。若n≤2+min{pᵢ}成立,则该方程具有Liouville性质:u有界意味着u为常数。
英文摘要
We consider entire solutions $u$: $\mathbb{R}^n \rightarrow \mathbb{R}$, $n \ge 2$, of the equation $\operatorname{div}(\nabla f(\nabla u)) = 0$ with convex density $f$: $\mathbb{R}^n \rightarrow \mathbb{R}$ given for example by $f(\nabla u) = \sum_{i=1}^n |\partial_i u|^{p_i}$ with exponents $p_i \ge 2$ including Giaquinta's example for the choice $p_1 = \dots = p_{n-1} = 2$, $p_n = 4$. If $n \le 2 + \min\{p_i\}$ holds, then we have the Liouville property: the boundedness of $u$ implies its constancy.