Re: Why Einstein is the founder of special relativity

cmaj10@xxxxxxxxx wrote:
> Juan R. wrote:
>
> [snip]
>
> > And as I already noted in previous posts, Einstein's 1905 paper uses
> > the same notation that Lorentz 1904 and begins the proof of LT from a
> > GALILEAN TRANSFORMATION (exactly like Lorentz did). Note that wavefro=
nt
> > is not spherical in x' because in Einstein 1905 words:
> >
> > "If we place x'=3Dx-vt, it is clear that a point at rest in the syste=
m k
> > must have a system of values x', y, z, independent of time."
> >
> > Why did Einstein begin with a Galilean transformation?
>
> I find your posts interesting and I agree with you on most points, but
> here is mistake. The quantity x' belongs to the system K at rest, not
> to the system k in motion. View it this way: you're in system K and you
> observe the evolving separation between stationary point x and the
> moving origin of system k. The x' quantity is simply that separation,
> in fact he could have written it as x'(t) to emphasize that point. To
> an observer in k, x'(t) has no direct meaning. In that 1905 paper,
> Einstein intends to map an event at x and t in K to an event at
> greek_xi and greek_tau in k, but mathematically it's easier to do it by
> actually mapping from x'(t) and t to greek_xi and greek_tau, and that's
> why he used x' instead of x. That's all there is to it. It's just a
> mathematical aid.
>
> Chris

Thanks Chris,

Is it true that x' is a mathematical aid or has physical sense? I think
that Einstein uses with full physical sense. Note that x' is defined in
terms of physical quantities. On any case, Einstein is a bit ambiguous
here

"it is clear that a point at rest in the system k must have a system of
values x', y, z, independent of time."

and i wait that people that critiques ambiguity of certain last
Poincar=E9's works recognizes that Einstein is also ambiguous.

However, i think that rest of my comment may be still interesting. He
begins like Lorentz and i find that very curious if Einstein newer read
Lorentz works after 1895. Einstein also use the same notation that
Lorentz in his 1904 paper.

Juan R.

Cetner for CANONICAL |SCIENCE)

.

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