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| bio | website | arcsecond.wordpress.com |
|---|---|---|
| location | Baltimore, MD | |
| age | 28 | |
| visits | member for | 2 years, 6 months |
| seen | 2 days ago | |
| stats | profile views | 273 |
I'm a physics graduate student.
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Jan 31 |
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Unusual 5th grade problem, how to solve it @gmline This wasn't supposed to be a method for enumerating all the answers or anything like that; just a way to approach it visually that might help for some kids. |
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Nov 29 |
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What's the expected value of a lottery ticket? @cardinal I hadn't thought of it that way, but it's a good point and looks right to me, thanks. |
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Nov 29 |
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What's the expected value of a lottery ticket? @FlybyNight $n$ is a random variable whose distribution is determined from $p$ and $t$. I believe you do have enough information. |
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Feb 13 |
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Singing Bird Problem @BrianM.Scott Yes, you're right, thanks. Tried a new answer. |
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Jan 22 |
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Can there be a cubical bubble? @Rahul Ah, now I see. What I meant is that the performer made a roughly cubical compartment, but it is not perfect. I wanted to know if a perfect cube was mathematically possible, or whether, for example, the corners would always be a little rounded off. |
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Jan 21 |
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Can there be a cubical bubble? Great answer! Thanks for all the references. |
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Jan 21 |
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Can there be a cubical bubble? @Rahul Yup, that's what I wanted to know. I just don't really understand how your comment addressed the question. I think there is something about it I'm missing. (I'm not a mathematician.) Will Jagy's answer was pretty much what I wanted. |
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Jan 21 |
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Can there be a cubical bubble? @Rahul I don't understand, sorry. How does this address whether or not there can be a cubical bubble? |
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Jan 12 |
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How many ways can $b$ balls be distributed in $c$ containers with no more than $n$ balls in any given container? Thank you. Yes, that was how I got that identity. |
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Dec 17 |
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Fourier transform for dummies Thanks! I will check it out. |
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Nov 25 |
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Point me the primordial and intuitive concepts about this operations on physics For an intro to EM, "Electricity and Magnetism" by Purcell is what I used. It was great. |
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Nov 25 |
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Point me the primordial and intuitive concepts about this operations on physics Well, I'm a physicist and I think I understand electric charge pretty well, but that page still doesn't make sense to me. I suggest finding a better resource. |
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Nov 25 |
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Point me the primordial and intuitive concepts about this operations on physics what are a, b, and c? It doesn't look like you ever defined them. |
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Nov 18 |
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Fourier-like expansion of a closed curve in 2D demonstration: youtube.com/watch?v=QVuU2YCwHjw |
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Nov 18 |
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Fourier-like expansion of a closed curve in 2D We can also think of it as just a usual complex-valued Fourier transform, since complex numbers can represent two dimensions. (I now see that Greg P pointed this out in the comments to the main question.) |
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Oct 11 |
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What is an example of an application of a higher order derivative ($y^{(n)}$, $n\geq 4$)? I've heard 4th, 5th, and 6th derivatives called "snap", "crackle", and "pop". |
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Apr 14 |
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What are the polar coordinates of the origin? I don't completely understand your answer. Can you give an example of a function discontinuous at the origin as you were mentioning, please? |
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Apr 14 |
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What are the polar coordinates of the origin? @Qiochu Thanks. How about derivatives? |
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Apr 1 |
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How to show $\arcsin{x} = \frac{\pi}{2} + i \ln{(x+\sqrt{x^2-1})}$? meaningful titles would also be helpful |
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Mar 25 |
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What are the 2125922464947725402112000 symmetries of a Rubik's Cube? @Joriki Thank you, but doesn't that give the wrong number? The size of the Rubik's cube group is 4*10^19 (en.wikipedia.org/wiki/Rubik's_cube_group). |
