How to find the number of characteristic curves of the PDE $(x^2+2y)u_{xx}+(y^3-y+u)u_{yy}+x^2(y-1)u_{xy}+3u_{x}+u=0,$ passing through the point $x =1, y= 1$.
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https://math.stackexchange.com/questions/262132/the-number-of-characteristic-curves-of-the-pde – Sam Christopher May 13 '17 at 07:09