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Quadratic nonlinear derivative Schrödinger equations. Part I
Department of Mathematics, University of California, Los Angeles (UCLA) Los Angeles, CA 90095-1555, USA E-mail address: bejenaru{at}math.ucla.edu
We consider the local well-posedness theory for the quadratic nonlinear Schrödinger equation with low regularity initial data in the case when the nonlinearity contains derivatives. We work in 2 + 1 dimensions and prove a local well-posedness result up to the scaling for small initial data with some spherical symmetry structure.