Recent content by mcastillo356

Really true. But I won't try any self made explanation. Thank you, @PeterDonis.

https://en.wikipedia.org/wiki/Proper_reference_frame_(flat_spacetime)

The source is Wikipedia. Thanks indeed. I'm reading a pdf of the Uned, a Spanish reliable University.. Anyhow, thank you for the advice.

I`m working on the right meaning of the concept "proper". I think it doesn't refer to any acceleration, as the source I read says. At this moment it's just an intuition.

@pervect has answered my doubts. Thanks a lot.

MOVING CLOCKS In this section, we show that clocks moving at high speeds run slowly. We construct a clock, called a light clock, using a stick of proper lenght ##L_0##, and two mirrors. The two mirrors face each other, and a pulse of light bounces back and forth betweem them. Each time the...

Not funny at all. Hope nobody is been injured.

https://es.wikipedia.org/wiki/American_Journal_of_Physics It's free.

Have a nice Thanksgiving Day!

Do you mean "Id est"? What software are you using? Anyhow, at PF it is not needed LaTeX to type ie; but in case you needed, it should be four #, and ie in the middle; ie, ##ie##.. Hope it helps.

You were there, I remember you answering to my doubts I keep you in my heart.

AI is not reviewed. I mean it doesn't mention sources of the given information.

I study by myself. It's tough. The thread explains it perfectly.

Lemma 5 and Lemma 6 seem easy, but I've had to think about set partitions and equivalence relations. Attempt For any equivalence relation on a set ##X##, the set of its equivalence classes is a partition of ##X##. Conversely, from any partition ##P## of ##X##, we can define an equivalence...

Lemma 2 is difficult to me Why ##A=A_{0}\sim{B_{1}}\sim{A_{2}}\sim{B_{3}}\sim{A_{4}}\sim{\cdots}##? Attempt ##A=A_{0}##, ##B_{1}=f(A_{0})##, and so on. Why is this a consequence of injectivity? Attempt A set mapping is injective if...