This paper undertakes a systematic treatment of the low regularity local wellposedness and ill-posedness theory in H^s and H^s for semilinear wave equations wit
<正>Let SO(n) act in the standard way on Cn and extend this action in the usual way to Cn+1 =C+Cn. It is shown that a nonsingular special Lagrangian submanifold
Here the authors are interested in the zero set of Sobolev functions and functions of bounded variation with negative power of integrability. The main result is