1. Department of Mathematics and Systems Science, BeiHang University, Beijing 100191, P. R. China;2. School of Mathematical Science, University of Chinese Academy of Science, Beijing 100049, P. R. China
Abstract:
We prove that for the 3D MHD equations with hyper-dissipations (-Δ)α (1 <α <5/4) the Hausdorff dimension of singular set at the first blowing up time is at most 5 - 4α, by means of physical and frequency localization, Bony's paraproduct and Littlewood-Paley theory.