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| visits | member for | 1 year, 6 months |
| seen | 5 mins ago | |
| stats | profile views | 893 |
An expert is a man who has made all the mistakes, which can be made, in a very narrow field. (Niels Bohr)
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38m |
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Why the $\nabla f(x)$ in the direction orthogonal to $f(x)$? @user1620696 I use Inkscape on Windows 7 platform. See the question in tex.stackexchange.com/questions/61274/… |
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41m |
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Why the $\nabla f(x)$ in the direction orthogonal to $f(x)$? @user1620696 I generated an image but because of some bug it does not appear in my answer. The image is visible to you? |
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May 22 |
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Solving 3 simultaneous cubic equations Numerical methods or algebric methods? |
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May 18 |
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Sequence $(a_n)$ s.t $\sum\sqrt{a_na_{n+1}}<\infty$ but $\sum a_n=\infty$ @ThomasAndrews I improviment my answer. |
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May 15 |
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Positive semidefiniteness of a block matrix of positive semidefinite matrices @ChrisGodsil Well, this is a hint to solve the exercise. It is clear that during the resolution will be issues to be considered. |
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May 14 |
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Positive semidefiniteness of a block matrix of positive semidefinite matrices @ChrisGodsil, I corrected my mistake. But it is a mistake that does not compromise the idea of proof.Thanks |
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May 14 |
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List videos of interesting courses at the doctoral level. @DonAntonio, well the videos I listed in my question is just to illustrate my point |
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May 14 |
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List videos of interesting courses at the doctoral level. @Alex I will not be specific as to the area of investigation. Since I believe that the answers here will be useful for students who are not my area of interest. But I have a preference for courses ergodic theory, Probability, Stochastic Processes, Combinatorics and Statistical Mechanics. |
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May 14 |
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Write a Java program on Palindromes @Khanat What is the mathematical aspect of your question? |
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May 14 |
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On the no trivial $3$-tuples $(p, q, \alpha) \in \mathbb{N}^3$ such that $\sum_{k = 1}^{n}k^p =\Big [\sum_{k=1}^{n}k^q\Big]^\alpha $. @CalvinLin simplicity with which you solved the issue made me embarrassed. Very nice your solution. |
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May 14 |
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On the no trivial $3$-tuples $(p, q, \alpha) \in \mathbb{N}^3$ such that $\sum_{k = 1}^{n}k^p =\Big [\sum_{k=1}^{n}k^q\Big]^\alpha $. I update my question |
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May 14 |
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On the no trivial $3$-tuples $(p, q, \alpha) \in \mathbb{N}^3$ such that $\sum_{k = 1}^{n}k^p =\Big [\sum_{k=1}^{n}k^q\Big]^\alpha $. @CalvinLin As I said non-trivial cases. And this means that $\alpha\geq 0$. |
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May 14 |
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It is possible to prove that these two collections generate the same topology on $ \mathbb{X} $? +1 For you. Excelent answer! Very nice notation. |
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May 7 |
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Algorithm to calculate multiple integral. @Norbert For human. |
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Apr 14 |
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Fast way to calculate determinant for a block matrix @mezhang Feel free to correct any errors. |
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Apr 13 |
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How do you find the limit of $\frac{4x^4 + 5y^4}{x^2 + y^2}$? But its construction is very good. The justifications just saw that can be fitted perfectly in the middle of his solution. |
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Apr 13 |
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How do you find the limit of $\frac{4x^4 + 5y^4}{x^2 + y^2}$? You need to justify some passages to limit their operations here. |
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Apr 12 |
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Matrix Representation of Operators in Infinite Dimensional (Separable) Hilbert Spaces @julien I corrected my little mistake in my answer. |
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Apr 11 |
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How can the proof of a local theorem on a manifold involving a map with a fixed point and a differential be reduced to the case of $\mathbb{R}^n$? You could also use the application exponential (and the fact that it identifies not closed geodesics and geodesic lines and identifies with closed circles). But your solution is much simpler. |
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Apr 11 |
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What is the real life use of hyperbola? @Inceptio Nice answer! (+1) |
