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| bio | website | marcofrasca.wordpress.com |
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| location | ||
| age | ||
| visits | member for | 1 year, 5 months |
| seen | 1 hour ago | |
| stats | profile views | 674 |
I am a theoretical physicist working in the area of quantum field theory, mostly QCD and gauge theories. I am also interested in mathematical problems related to the solution of PDEs.
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Aug 3 |
answered | Solution to a second order semilinear elliptic PDE |
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Jul 30 |
comment |
Solution to a second order semilinear elliptic PDE Are you sure about the last term in your equation? Shouldn't it be $u(u_r)^2$ rather than $u^2(u_r)$? |
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Jul 29 |
comment |
Laplace transform of a product of Modified Bessel Functions @J.M.: Thanks for your comment. I did it taking into account that I worked this out with Mathematica and held the further definition taken Wikipedia. |
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Jul 29 |
revised |
Laplace transform of a product of Modified Bessel Functions Edited the definition of the elliptic integral |
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Jul 28 |
comment |
Wiener process question This is not so. "cumsum" is always needed as you are describing a trajectory that, while has not derivative, is anyway continuous. The other way is just to write dW2(j)=dW2(j)+W2(j-1) and plotting dW2 but is not so efficient. You can find some code at marcofrasca.wordpress.com/2012/02/02/… and comments there. |
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Jul 28 |
comment |
Wiener process question You have to sum all the increments. This is the reason why the first code works ("cumsum") and the the second one does not. |
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Jul 27 |
comment |
Laplace transform of a product of Modified Bessel Functions I think Sasha's answer fits the bill. |
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Jul 27 |
answered | Laplace transform of a product of Modified Bessel Functions |
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Jul 27 |
comment |
Show $1 + 2 \sum_{n=1}^N \cos n x = \frac{ \sin (N + 1/2) x }{\sin \frac{x}{2}}$ for $x \neq 0$ This can be reduced to a geometric series just noting that $\cos nx =\frac{e^{inx}+e^{-inx}}{2}$. |
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Jul 27 |
revised |
Integral equation with a constraint Minor correction |
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Jul 26 |
revised |
Integral equation with a constraint Added an existence condition |
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Jul 26 |
answered | Integral equation with a constraint |
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Jul 25 |
comment |
Is there a known closed form number for $\prod\limits_{k=2}^{ \infty } \sqrt[k^2]{k}$ Try using Euler-Maclaurin formula en.wikipedia.org/wiki/Euler%E2%80%93Maclaurin_formula. |
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Jul 23 |
accepted | Moving to a conformal metric |
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Jul 22 |
comment |
Moving to a conformal metric Yes, the content of this answer is not worth downvote being very near to my aims and of course, flagging it as spam is blatantly wrong. I understand that Chandra was a physicist and the cited book is about physics, but this guy should be treated somewhat better. |
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Jul 20 |
comment |
Moving to a conformal metric Thanks Leonid. I will check the approach devised in Wikipedia. The reference you gave seems really interesting. |
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Jul 19 |
comment |
Moving to a conformal metric @WillieWong: My problem is that I have the metric given and I would like to turn it into a conformal shape in order to apply a theorem on Cramer-Rao optimal estimators. So, if I would have a quite general result, I should be able to accomplish the task. |
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Jul 19 |
comment |
Moving to a conformal metric @WillieWong: I am aware of this. But can they always be given explicitly in this case? |
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Jul 19 |
asked | Moving to a conformal metric |
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Jul 11 |
revised |
The puzzling eigenvalues of a differential equation system Minor correction |
