Some remarks on singular solutions of nonlinear elliptic equations. I
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- Caffarelli, L., Li, Y.Y. & Nirenberg, L. J. fixed point theory appl. (2009) 5: 353. doi:10.1007/s11784-009-0107-8
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We study strong maximum principles for singular solutions of nonlinear elliptic and degenerate elliptic equations of second order. An application is given on symmetry of positive solutions in a punctured ball using the method of moving planes.