vela's latest activity

You're assuming the usual momentum operator is valid for a particle confined to a finite region.

Finitism seems more of an intellectual exercise than an attempt to progress mathematics.

Is synchronization that important? For each course here, we have a course outline of record (COR), which lists the topics that should...

Yes, I do think it is possible that kids today don't need to learn the Riemann - Roch theorem. I don't think your birthdate is the issue...

Here, we don't see a surcharge for using a credit card for most bills. Typically, you only see a surcharge when dealing with the...

For the vast majority of people in the US, I'd say the need to write a check is much more common than the need to milk a cow. On the one...

You can go old school and look it up in a dictionary. According to the American Heritage Dictionary, the definition of right is "Of...

While increasingly rare, there are still situations where they still need to know how to write a check. Analogue clocks are still...

Given that the top branch is identical to the bottom branch, the fact that you concluded the current somehow flowed in opposite...

Griffiths went through the same derivation for ##\nabla \cdot \frac{\hat r}{r^2}## to show that there's a delta function at the origin...

I would write two unit vectors $$\mathbf{\hat r}_i=\cos\phi_i\cos\lambda_i~\mathbf{\hat x}+\sin\phi_i\cos\lambda_i~\mathbf{\hat...

This site is a good reference for all things calculus: https://tutorial.math.lamar.edu/classes/de/de.aspx

The quantity it represents is important, but not necessarily expressed in terms of the spatial velocity ##v##. Indeed...

You've gotten some good advice. I'll highlight what I think is important, and also throw in my two cents. * There is no one...

I use it mainly for the same reason @weirdoguy stated. It's a pain to keep writing the square root down, and not using it makes the...