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arXiv 0810.2739math.AP
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二阶$B(\mathbb R^{2}, VMO)$系数椭圆型和抛物型方程

Second-order elliptic and parabolic equations with $B(\mathbb R^{2}, VMO)$ coefficients

Hongjie Dong, N. V. Krylov

摘要:

证明了二阶非散度型抛物型方程在索伯列夫空间$W^{1,2}_p$中的可解性,其中$p>2$接近2。假定首项系数在时间变量和空间变量的两个坐标上是可测的,并且关于其他坐标几乎是VMO(消失平均振荡)。这意味着对于首项系数在两个坐标系中可测而在另一个坐标系中可测的非散度型椭圆型方程的相同$p$,存在$W^{2}_p$ -可解性.在稍有不同的假设下,我们也得到了当$p=2$。

英文摘要:

The solvability in Sobolev spaces $W^{1,2}_p$ is proved for nondivergence form second order parabolic equations for $p>2$ close to 2. The leading coefficients are assumed to be measurable in the time variable and two coordinates of space variables, and almost VMO (vanishing mean oscillation) with respect to the other coordinates. This implies the $W^{2}_p$-solvability for the same $p$ of nondivergence form elliptic equations with leading coefficients measurable in two coordinates and VMO in the others. Under slightly different assumptions, we also obtain the solvability results when $p=2$.

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