Sameh Shenawy
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 Apr 23 accepted Lie derivative of two differnt size related tensors Apr 23 comment Lie derivative of two differnt size related tensors Thank you. It does work. Apr 23 comment Lie derivative of two differnt size related tensors So you mean I should start with $$\bar {\frak{L}}_{h\partial _t}(\bar R(X,\partial_t,\partial_t,Y))= \bar {\frak{L}}_{h\partial _t}(\bar g(\frac{-\ddot f}{f}X,Y))$$ Apr 23 comment Lie derivative of two differnt size related tensors Now, I understand your point. I am going to check it Apr 23 comment Lie derivative of two differnt size related tensors I am OK with this formula and got the LHS using it. I want to understand why the RHS is different. You have repeated my question. We take the Lie derivative of both sides. Why they are different? Apr 23 revised Lie derivative of two differnt size related tensors added 17 characters in body Apr 23 asked Lie derivative of two differnt size related tensors Mar 28 answered How to solve this exact differential equation $(y-x^2)dx + xdy = 0$? Feb 8 awarded Taxonomist Feb 6 comment Write $\gamma(t) = (t,t^2,t^3)$ as a graph and a level set @diffGeoLost A level set of a function $f$ is a set points where $f=c$ for some constant $c$ Jan 2 comment Does $\sum_{n=1}^\infty \frac{2\cdot 4\cdot 6\cdot …\cdot (2n)}{n^n}$ converge? I think it is easy to use ratio test Dec 31 reviewed Leave Open Differential of determinant of metric tensor Dec 31 comment Let $f(x)$ be a differentiable function on real number line such that $\lim_{x\to \infty} f(x) = 1$ and $\lim_{x\to \infty} f'(x) = a$ The asymptote line to $f(x)$ is $y=1$ and the slope of this line is $0$. Dec 31 comment confusion about permutation your mistake is that 72 includes 8, so you subtract 8 twice Dec 31 revised confusion about permutation added 5 characters in body Dec 31 comment confusion about permutation Could you please write what you did Dec 21 comment Generalization of integrating factor? @yhhuang Excellent Dec 21 comment Generalization of integrating factor? Did you try to evaluate and use it for $n=2$? Dec 20 awarded Yearling Dec 18 comment Compute using the define of Lie derivative. @lanse7pty Could you please add the book information(name, author, page)