分数凸性
Fractional convexity
摘要:
我们引入一个分数凸的概念,自然地扩展了通常的概念,凸的欧几里得空间的分数设置。分数凸性的概念,我们研究了分数凸包络内的一个域的外部数据(最大可能的分数凸函数内的域,低于基准外),并表明,分数凸包络的特点是黏性解的非局部方程,这是由下确界之间的所有可能的方向的$1-$维分数拉普拉斯算子。对于这个方程,我们证明存在性,唯一性和比较原则(在黏性解的框架)。此外,我们发现凸包络方程的解与分数Monge-Ampere方程的解有关。
英文摘要:
We introduce a notion of fractional convexity that extends naturally the usual notion of convexity in the Euclidean space to a fractional setting. With this notion of fractional convexity, we study the fractional convex envelope inside a domain of an exterior datum (the largest possible fractional convex function inside the domain that is below the datum outside) and show that the fractional convex envelope is characterized as a viscosity solution to a non-local equation that is given by the infimum among all possible directions of the $1-$dimensional fractional Laplacian. For this equation we prove existence, uniqueness and a comparison principle (in the framework of viscosity solutions). In addition, we find that solutions to the equation for the convex envelope are related to solutions to the fractional Monge-Ampere equation.
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