# Search Results

1. Post

### I Looking for a proof that u(x) du(x)/dx = 0.5 d(u(x)^2)/dx

Did you ever encounter the product rule for derivatives? Or the chain rule? Both work.
Post by: Orodruin, Apr 25, 2017 at 5:37 AM in forum: Calculus
2. Post

### I Completeness relation

Still no. Still an impossible condition.
Post by: Orodruin, Apr 23, 2017 at 11:45 PM in forum: Quantum Physics
3. Post

### Showing Levi-Civita properties in 4 dimensions

You are missing terms. The anti-symmetrisation over the 4 indices should have 4! = 24 terms, not 8.
Post by: Orodruin, Apr 23, 2017 at 2:15 PM in forum: Advanced Physics Homework
4. Post

### Showing Levi-Civita properties in 4 dimensions

In 4 dimensions $\delta_{ii} = 4$.
Post by: Orodruin, Apr 23, 2017 at 1:42 PM in forum: Advanced Physics Homework
5. Post

### Other Exam grades and postdoc positions

I should mention that my perspective is purely European (although I applied for some postdoc positions in the US) and restricted to the...
Post by: Orodruin, Apr 23, 2017 at 10:55 AM in forum: Academic Guidance
6. Post

### Other Exam grades and postdoc positions

Post by: Orodruin, Apr 23, 2017 at 5:49 AM in forum: Academic Guidance
7. Post

### I Completeness relation

No. Same reason.
Post by: Orodruin, Apr 22, 2017 at 8:41 AM in forum: Quantum Physics
8. Post

### I Completeness relation

No. The trace of the unit operator is not one so you have a problem there already.
Post by: Orodruin, Apr 22, 2017 at 2:07 AM in forum: Quantum Physics
9. Post

### I New Way of Particle Accelerating?

Well, the quantity I quoted was $c-v$ so if that is positive $v < c$. Alternatively, $v \simeq 0.999999995c$.
Post by: Orodruin, Apr 22, 2017 at 1:36 AM in forum: High Energy, Nuclear, Particle Physics
10. Post

### I Why uranium glass glows green if it's under UV light?

Fluorescence.
Post by: Orodruin, Apr 21, 2017 at 11:15 AM in forum: Atomic & Condensed Matter
11. Post

### Heat equation integral - Fourier Series coefficient is zero

No it isn't. You are expanding u in the series - not T.
Post by: Orodruin, Apr 19, 2017 at 12:04 PM in forum: Advanced Physics Homework