Dirk Van de moortel <dirkvandemoortel@nospAm.hotmail.com> wrote in message
  bODcq.8419$TP6.3481@newsfe13.ams2
> Androcles <Headmaster@Hogwarts.physics.September.2011> wrote in message
>  vSxcq.7804$BK4.2256@newsfe22.ams2
> 
> [snip]
> 
>> You don't think at all; the math is easy.
>> The top is passing the stationary bottom at velocity v = x/t.
>> By the principle of relativity the bottom is passing the top at
>> velocity upsilon = xi/tau.
 
> No moron, by the principle of relativity as the people on this planet
> know it, the bottom is passing the top at velocity -v.
> 
> xi and tau are the coordinates in the top-frame of all events for
> which the bottom frame uses coordinates x and t, so if something
> has an equation of motion
>        x = v t
> in the bottom frame, then that *same something* has the equation
> of motion
>        xi = upsilon tau
> in the top frame -- by definition.
> In this case, that something is the top itself, and the top has
> velocity 0 in its own frame.
> 
> So upsilon is the velocity at which the top is passing ITSELF.
> That is zero and you have just given the proof:
 
>> We know what xi and tau are, courtesy of Einstein.
>> 
>>                       (x-vt)/sqrt(1-v^2/c^2)
>> upsilon = -------------------------------------
>>                          t * sqrt(1-v^2/c^2)
>> 
>> Multiplying both top and bottom of the equation by sqrt(1-v^2/c^2),
>> 
>> 
>>                                (x-vt)
>> upsilon = -------------------------------------
>>                          t * (1-v^2/c^2)
>> 
>> Substituting v for its value,
>> 
>>                                (x-t*x/t)
>> upsilon = -------------------------------------
>>                           t * (1-v^2/c^2)
>> 
>> Cancelling t,
>> 
>>                                (x-x)
>> upsilon = -------------------------------------
>>                           t * (1-v^2/c^2)
>> 
>> Hence
>>                                (0)
>> upsilon = -------------------------------------
>>                           t * (1-v^2/c^2)
>> 
>> Einstein's Lorentz transformation (or Lorentz's Einstein transformation)
>> has always been valid for v = upsilon = 0.
>> 
>> It was dreadful to attract one more unreasonably stupid reply amongst
>> the usual nonsense that one invariably receives when posting a moronic
>> article here. Thank you.
>> 
>> Of course, as you can't do the math and do not think you cannot be
>> fucking SERIOUS!
> 
> Without understanding the meaning of coordinates and transformations,
> and without having a clue about what he was doing, Androcles has just
> proven that, when he moves at velocity v with respect to me, he moves
> with velocity 0 with respect to himself. Congratulations!
> 
> Dirk Vdm

> [snip]
> 
Mission accomplished.
Always pleased to snip a fuckwit like you whenever requested to do so.
Anything else I can snip for you?

The Famous Fumble Mumble:
<http://www.tinyurl.com/FumbleMumble>

"So if T = 5 years and v = 0.8c, then the stay at home twin will
have aged 10 years while his travelling twin sister will have aged
6 years.
Dork Vdm, 12 Nov, 2002.

T = 9 years, Dork has aged 18 years, he stayed at home.

Dork and arithmetic:
tau = t * sqrt(1-v^2)
 = 10  * sqrt(1 - 0.8^2)
 = 10 * sqrt(1 -0.64)
 = 10 * sqrt( 0.36)
 = 10 * 0.6
 = 6