# American Institute of Mathematical Sciences

June  2010, 28(2): 607-615. doi: 10.3934/dcds.2010.28.607

## On the local solvability of the Nirenberg problem on $\mathbb S^2$

 1 Department of Mathematics, Rutgers University, 110 Frelinghuysen Road, Piscataway, NJ 08854, United States 2 Department of Mathematics, Rutgers University, Hill Center, 110 Frelinghuysen Rd., Piscataway, NJ 08854

Received  January 2010 Revised  March 2010 Published  April 2010

We present some results on the local solvability of the Nirenberg problem on $\mathbb S^2$. More precisely, an $L^2(\mathbb S^2)$ function near $1$ is the Gauss curvature of an $H^2(\mathbb S^2)$ metric on the round sphere $\mathbb S^2$, pointwise conformal to the standard round metric on $\mathbb S^2$, provided its $L^2(\mathbb S^2)$ projection into the the space of spherical harmonics of degree $2$ satisfy a matrix invertibility condition, and the ratio of the $L^2(\mathbb S^2)$ norms of its $L^2(\mathbb S^2)$ projections into the the space of spherical harmonics of degree $1$ vs the space of spherical harmonics of degrees other than $1$ is sufficiently small.
Citation: Zheng-Chao Han, YanYan Li. On the local solvability of the Nirenberg problem on $\mathbb S^2$. Discrete & Continuous Dynamical Systems - A, 2010, 28 (2) : 607-615. doi: 10.3934/dcds.2010.28.607
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