[Moderator's note: If you already changed your way to post to newsgroups   
   it hasn't helped. I had to adjust the posting again. Use plain ASCII and   
   a true news client (e.g., Thunderbird), not a web interface or something   
   the like.]   
      
   Jos Bergervoet alle ore 13:43:18 del 08/08/2017 ha scritto:   
   > [Moderator's note: The idiosyncratic characters result from not using a   
   > proper news client to post to sci.physics.research. In fact in my   
   > moderation process I always try to repair this as far this is possible   
   > in an automized way. hvh.]   
   >   
   > On 8/8/2017 9:36 AM, LuigiFortunati wrote:   
   >   ...   
   >> =A0=A0   
   >> =A0=A0 I ask you:   
   >   
   > Luigi, can you please post more readable text? I do not know what   
   > you mean with "=A0=A0" and similar insertions.   
      
   I am not the one who puts these curses "=A0=A0", now I will try to   
   change my news client (MESNEWS) as the moderator suggests (I will use   
   GOOGLE GROUPS).   
      
   >> can the transition from one reference to another only be   
   >> achieved with acceleration (as in this case) or is there any other way   
   >> to achieve it?   
   >   
   > There is no prescribed reference frame to use. Everyone is free   
   > to use any reference system, *also* those in which he himself is   
   > not at rest. So the transition to another reference frame can be   
   > achieved simply by a decision: "let me now use reference frame   
   > Y instead of X for my calculations".   
   >   
   > If, for whatever reason, you insist (unnecessarily) on using only   
   > the reference frame in which you are at rest, then (by your own   
   > choice) you need to change your velocity to be able to use another   
   > reference frame. But then this is just your own chosen rule.   
   >   
   > A reference frame is just a grid of coordinates. There is no law   
   > in physics that forces you to use any specific grid. You can even   
   > use arbitrarily curved coordinate lines (which were not yet   
   > considered in this discussion until now).   
   >   
   > Your questions are only about your own superficial choices of   
   > choosing some specific reference frame. You maybe have the idea   
   > that there is only one choice allowed, from popular descriptions   
   > of the theory of relativity. But those descriptions are wrong!   
   >   
   > It is *not true* that if you are moving at some speed, you're only   
   > allowed to use one reference frame. Please change your beliefs.   
      
   I did not ask if there is a prescribed reference frame to use for   
   calculations.   
      
   I asked if anyone who is at rest in a certain K can go to being at rest   
   no more than K but to another K' (at gamma=8 than K) without accelering   
   some "spaceship".   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)