pervect's latest activity

Two dimensional

Not a paradox, but a rather hard problem. To deal with the problem with special relativity, I'd suggest replacing gravity due to mass...

Sorry for this very late response. My first thought was that you had a good point, but as I was thinking about this more later, and I...

I've been assuming the answer to this question is, informally, "the shortest path". The mathematical term is the "Levi-Civita...

I have not read anything definitive on that, but my current thinking is that it's not possible in general, but it may be possible in...

My intuition leads to a similar conclusion, but I think we would need to clarify what a "beam" is in this context. I am not sure I have...

I'll start out by giving some (I hope) interesting references on the topic of sector models, which describe an approach to learning...

It's unclear to me what mathematics models a "large sheet of paper" in the current context. So I don't have anything rigorous. But...

As I think about the issue more, I h ave to note that my calculations were NOT based on an experimental defintion for energy (or...

In the context of my favorite easy-to-understand (though not necessarily most accurate) test of relativity described in "The Ulitmate...

I like the definition of measuring the energy with a calorimeter - or by the ability to penetrate an armor plate if one has a...

I'd agree that the momentum is some constant times the (1, beta,0,0), where beta is the normalized coordinante velocity. (in this...

Well, it looks like I was overcomplicating the analysis. Unless I've made an error (quite possible), [1,0,0,0] and [0,1,0,0] are both...

Just to clarify - this is the geodesic Lagrangian of a free particle, not the relativistic Lagrangian of a free particle, is that...

Yes, I personally think it would be simpler to introduce relativity by means of proper velocity, or as you write it ##dx/d\tau##. Do...