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I have a small pb:

Let [tex]\displaystyle{M=\mathbb{R^{2}\{(x,y);x=0\quad ou \quad y=-1}[/tex]

Let D such that Christoffel symboles different from 0 are\\\\

[tex]\displaystyle\Gamma_{11}^{1}(x,y)=-\frac{1}{x}\\\\\\\\

\Gamma_{22}^{2}(x,y)=\frac{1}{1+y}[/tex]\\\\\\

How calculate curvurture?????????\\

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# Curveture math problem

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