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| bio | website | robertfilter.de |
|---|---|---|
| location | Jena, Germany | |
| age | 30 | |
| visits | member for | 2 years, 7 months |
| seen | Feb 4 at 14:03 | |
| stats | profile views | 205 |
If you like electrodynamic problems with solutions and their connections to current research, please visit www.problemsinelectrodynamics.com
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Jan 19 |
comment |
Fourier Transform of an unsteady function Thank you for your answer. I must admit that I never had any course on measure theory so I have to speculate that I really want to calculate the first version. Greets |
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Jan 19 |
asked | Fourier Transform of an unsteady function |
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Jan 19 |
answered | Simple Harmonic Oscillator Solution |
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Jan 19 |
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Mathematical difference between white and black notes in a piano Please, Rudi, it should be Helmhol t z. :) |
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Jan 18 |
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Effect of curvature of spacetime on intrinsic geometric properties (under general relativity) @Steven: Thank you for your further thoughts. First of all I have to state that the choice of a timeslice would be the gauge I was referring to - hence angles will depend on this choice. Second of all the author is referring to lines of sight - I would interprete these as light geodesics. So, to maybe find a compromise here: One could define such angles more generally but they would depend on the gauge. Is this along your lines of thought? Greets |
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Jan 18 |
awarded | Revival |
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Jan 18 |
comment |
Effect of curvature of spacetime on intrinsic geometric properties (under general relativity) @Steven: Thank you for your thoughts - I am not sure if I get them correctly, though. Assuming you are in a dynamic spacetime you can go from A to B to C on some geodesic. How do you go to A from C? It wont be possible with respect to causality. So you will have to define an equivalence class of points A - but in a dynamical spacetime this construction will be due to a certain gauge - your angle will depend on this as well. I wanted to leave out these things for simplicity. Greets |
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Jan 18 |
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Writing an Integral in Different Form? @Willie Wong: Thanks you, I wrote small $n$'s if I remember correctly. Greets |
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Jan 18 |
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Effect of curvature of spacetime on intrinsic geometric properties (under general relativity) @Ronaldo: Now looking at the comments I think I have just done what you had in mind :) Greets |
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Jan 18 |
answered | Writing an Integral in Different Form? |
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Jan 18 |
answered | Effect of curvature of spacetime on intrinsic geometric properties (under general relativity) |
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Jan 14 |
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Eigenfunctions of the Helmholtz equation in Toroidal geometry @Hans Lundmark: Thank you for the hint. I just found the book in our library and will have a look. Is this a classic like the Courant-Hilbert? |
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Jan 14 |
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Eigenfunctions of the Helmholtz equation in Toroidal geometry @Willie Wong: Thank you for the correction. Indeed, I mean it in this way. It seems to as if it is just a historic issue of applied mathematics that some "special" functions (trigonometric, Bessel etc) paved their way into standard textbooks. Nevertheless, do you know if there are implicit definitions of solutions available like the elliptic ones? If I remember correctly, the Greens function of the Helmholtz equation is normally constructed from eigenfunctions of the Laplace... Isn't an application of this procedure applicable here somehow? |
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Jan 14 |
revised |
Eigenfunctions of the Helmholtz equation in Toroidal geometry added 353 characters in body |
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Jan 14 |
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Eigenfunctions of the Helmholtz equation in Toroidal geometry @Hans: Thanks for pointing out to the error, I will correct it. And also thank you for the link. It really is a pitty that there is no reference given. Greets |
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Jan 14 |
asked | Eigenfunctions of the Helmholtz equation in Toroidal geometry |
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Jan 13 |
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Stochastic interpretation of Einstein Equations @Willie Wong: Thank you again for your nice comments! You have a lot of knowledge about the structure of general relativity and the underlying geometrical and functional concepts and I enjoy reading your thoughts. So, for this question, the situations seems to be arbitrarily complicated - even though there might exist a corresponding stochastic process we simply don't know it yet :) You may consider posting your comments as answer, I would be glad to accept. Sincerely |
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Jan 13 |
revised |
Stochastic interpretation of Einstein Equations re-inserted thank you which was edited away :) |
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Jan 12 |
awarded | Commentator |
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Jan 12 |
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What is the key to success for a mathematician? True, especially the last paragraph. |
