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From: valls on 20 May 2010 09:19
In his first Relativity paper (30June1905), after declaring the ether
superfluous, Einstein considers a material point at rest. He uses a
system of Cartesian coordinates in which the equations of Newtonian
mechanics and Euclidean geometry hold good. If the massive body is
alone (and then without a Newtonian gravitational force acting on it),
it must remains forever at rest in its own centre of mass inertial
frame.
RVHG (Rafael Valls Hidalgo-Gato)
From: mpc755 on 20 May 2010 09:30
On May 20, 9:19 am, va...(a)icmf.inf.cu wrote:
> In his first Relativity paper (30June1905), after declaring the ether
> superfluous, Einstein considers a material point at rest. He uses a
> system of Cartesian coordinates in which the equations of Newtonian
> mechanics and Euclidean geometry hold good. If the massive body is
> alone (and then without a Newtonian gravitational force acting on it),
> it must remains forever at rest in its own centre of mass inertial
> frame.
> RVHG (Rafael Valls Hidalgo-Gato)

Einstein did not say the aether was superfluous. Einstein said an
absolutely stationary space was superfluous.

http://en.citizendium.org/wiki/Ether_%28physics%29

'The introduction of a "luminiferous aether" (Lichtäther) will prove
to be superfluous inasmuch as the view here to be developed will not
require an "absolutely stationary space" provided with special
properties, nor assign a velocity vector to a point of the empty space
in which electromagnetic processes take place.'

Space is not absolutely stationary.

Aether and matter are different states of the same material.
Aether is displaced by matter.
Displacement creates pressure.
Gravity is pressure exerted by the displaced aether towards the
matter.
From: harald on 20 May 2010 09:50
On May 20, 3:19 pm, va...(a)icmf.inf.cu wrote:
> In his first Relativity paper (30June1905), after declaring the ether
> superfluous, Einstein considers a material point at rest. He uses a
> system of Cartesian coordinates in which the equations of Newtonian
> mechanics and Euclidean geometry hold good. If the massive body is
> alone (and then without a Newtonian gravitational force acting on it),
> it must remains forever at rest in its own centre of mass inertial
> frame.
> RVHG (Rafael Valls Hidalgo-Gato)

If it were alone, yes. But then a theory about relative motion of
reference systems would certainly be superfluous. ;-)

Cheers,
Harald
From: mpc755 on 20 May 2010 09:53
On May 20, 9:50 am, harald <h...(a)swissonline.ch> wrote:
> On May 20, 3:19 pm, va...(a)icmf.inf.cu wrote:
>
> > In his first Relativity paper (30June1905), after declaring the ether
> > superfluous, Einstein considers a material point at rest. He uses a
> > system of Cartesian coordinates in which the equations of Newtonian
> > mechanics and Euclidean geometry hold good. If the massive body is
> > alone (and then without a Newtonian gravitational force acting on it),
> > it must remains forever at rest in its own centre of mass inertial
> > frame.
> > RVHG (Rafael Valls Hidalgo-Gato)
>
> If it were alone, yes. But then a theory about relative motion of
> reference systems would certainly be superfluous. ;-)
>
> Cheers,
> Harald

A theory about relative motion of reference systems is superfluous.

Everything moves with respect to the aether.

'Ether and the Theory of Relativity by Albert Einstein'
http://www-groups.dcs.st-and.ac.uk/~history/Extras/Einstein_ether.html

"the state of the [ether] is at every place determined by connections
with the matter and the state of the ether in neighbouring places".

The state of the aether as determined by its connections with the
matter and the state of the aether in neighboring places is the
aether's state of displacement.

There is no absolute rest frame. The absolute reference frame is the
state of the aether which is the aether's state of displacement.
From: valls on 20 May 2010 12:10
On 20 mayo, 08:30, mpc755 <mpc...(a)gmail.com> wrote:
> On May 20, 9:19 am, va...(a)icmf.inf.cu wrote:
>
> > In his first Relativity paper (30June1905), after declaring the ether
> > superfluous, Einstein considers a material point at rest. He uses a
> > system of Cartesian coordinates in which the equations of Newtonian
> > mechanics and Euclidean geometry hold good. If the massive body is
> > alone (and then without a Newtonian gravitational force acting on it),
> > it must remains forever at rest in its own centre of mass inertial
> > frame.
> > RVHG (Rafael Valls Hidalgo-Gato)
>
> Einstein did not say the aether was superfluous. Einstein said an
> absolutely stationary space was superfluous.
>
> http://en.citizendium.org/wiki/Ether_%28physics%29
>
> 'The introduction of a "luminiferous aether" (Lichtäther) will prove
> to be superfluous inasmuch as the view here to be developed will not
> require an "absolutely stationary space" provided with special
> properties, nor assign a velocity vector to a point of the empty space
> in which electromagnetic processes take place.'
>
> Space is not absolutely stationary.
>
And who is saying that it is? Following your own reference, 1905
Einstein considers the ether superfluous because he identifies it with
an absolutely stationary space that he not requires. I don't care if
you or any other after 1905 (including Einstein himself) has a
different opinion. The topic of this thread refers only to 1905
Relativity.

RVHG (Rafael Valls Hidalgo-Gato)
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