From: ttt_heg@web.de   
      
   Am Sonntag000005, 05.10.2025 um 23:04 schrieb Python:   
   > Le 05/10/2025 à 10:42, Thomas Heger a écrit :   
   >> Am Samstag000004, 04.10.2025 um 15:18 schrieb Python:   
   >> ...   
   >>>>>>>> My problem was, that I thought about 'local time' and therefore   
   >>>>>>>> wanted 'A-time' to be named 't' and 'B-time' values 'tau'.   
   >>>>>>>   
   >>>>>>> Why "what you want" would be of any interest when it comes to   
   >>>>>>> analyze Einstein's paper?   
   >>>>>>   
   >>>>>> Well, actually the author had to tell his story and the reader had   
   >>>>>> to read.   
   >>>>>>   
   >>>>>> If the author writes stories, which you could interpret in many   
   >>>>>> different ways, than the text has to be understood by the least   
   >>>>>> likely interpretation, because ambiguity goes against the author.   
   >>>>>   
   >>>>> Einstein's paper left no room for interpretation. You introduced   
   >>>>> them because you misunderstood 99% of what he wrote.   
   >>>>>>> tau is a time coordinate in another frame of reference,   
   >>>>>>> definitely not "B-time".   
   >>>>>>   
   >>>>>> Sure: A has a time called 'A-time' and B a time called 'B-time'   
   >>>>>> Since 'A-time' is not equal to 'B-time'   
   >>>>>   
   >>>>> What could it means for two values that are constantly changing (a   
   >>>>> number displayed by a clock !) to be "equal" or "not equal" ?   
   >>>>>   
   >>>>>> A and B belong to two different frames of reference.   
   >>>>>   
   >>>>> No. They are clocks mutually at rest, which is a definition of   
   >>>>> devices in a single frame of reference.   
   >>>>>   
   >>>>> Moreover everything belong to ALL frames of reference. Everything   
   >>>>> than happens, happens for anyone.   
   >>>>   
   >>>> No, since you are confusing 'coordinate system' and 'frame of   
   >>>> reference'.   
   >>>   
   >>> They are the SAME thing. A coordinate system includes space AND time.   
   >>   
   >> No!   
   >>   
   >> Especially the Euclidean system (which Einstein mentioned) is meant to   
   >> be 'timeless'.   
   >   
   > Absolutely not. If you missed that point there is no question about why   
   > your "comments" are dumb.   
   >   
   > « Let us take a system of co-ordinates in which the equations of   
   > Newtonian mechanics hold good »   
   >   
   > Newtonian mechanics involved both space AND time.   
   lol   
      
   Sure, Newton used space and time, but not in a single 'space'.   
      
   Newton distinguished space and time as absolute, but fundamentally   
   different quantities.   
      
      
   The space Newton mean with 'absolute' was actually a real valued 3D   
   physical space.   
      
   That space is commonly called 'Euclidean space'.   
      
   Other uses for the same term are also common, but I would prefer to   
   restrict the use to Newtons absolute space.   
      
   >   
   > Just a line above :   
   >   
   > « If a material point is at rest relatively to this system of co-   
   > ordinates, its position can be defined relatively thereto by the   
   > employment of rigid standards of measurement and the methods of   
   > Euclidean geometry, and can be expressed in Cartesian co-ordinates. »   
      
      
   Euclidean space and Cartesian coordinates do in fact belong together.   
      
   And such coordinates are meant as 'timeless'.   
      
   This means, that Cartesian coordinates do not depend on time and are not   
   'relative'.   
      
   > Which is about the space coordinates, then :   
   >   
   > « If we wish to describe the motion of a material point, we give the   
   > values of its co-ordinates as functions of the time. »   
   >   
   > See: TIME !!!   
      
   See 'FUNCTION OF TIME' !!!   
      
   The coordinates of that 'material point' are in fact a function of time.   
      
   Such a function spits out coordinates if you plug in time values.   
      
   But that doesn't mean, that coordinates contain time.   
      
      
   >   
   > Einstein explicitly wrote that what he consider a "system" involve both   
   > SPACE and TIME coordinates!!!   
      
   It's a little tricky, because the meaning of the term 'coordinates'   
   isn't equal in physics and mathematics.   
      
   In physics we mean  'spacial coordinates' with 'coordinates', while   
   mathematicians can utilise all sorts of coordinates.   
      
   Time isn't really a free parameter, because you cannot freely move in time.   
   ..   
   TH   
      
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