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9:37 AM
A new tag was created by miosaki.
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Q: equation for tangent plane to the surface at $p$.

miosaki$p=(2,-1,z_0)$ lies on the surface $ z- \ln(2x^2+y^2)+\ln 3=0$, we need to determine $z_0$ and equation for tangent plane to the surface at $p$. $z_0-\ln(4+1)+\ln 3=0\Rightarrow z_0=\ln \frac{5}{3}$. Could anyone help me the next step? Thanks!

 
4 hours later…
1:44 PM
There is an post which was migrated here: matrix-inverse in a quadratic form.
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Q: matrix-inverse in a quadratic form

LudwigLet $A=\{a_{ij}\}$ be a $n\times n$ symmetric and positive definite matrix, it's well known that, for some $n$-vector $x$, $x'Ax$ is a scalar: $$ x'Ax=\sum_{i=1}^n\sum_{j=1}^n a_{ij}x_i x_j. $$ What can be said about the quadratic form $x'A^{-1}x$? Is it possible to write is as a function of the...

 
7 hours later…
9:05 PM
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Q: how should this question be tagged

Stojkoski Nikola I have a question about my Mathematics Stack Exchange post: A math/beauty question


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