Re: Einstein's logic

From: Bill Hobba (bhobba_at_rubbish.net.au)
Date: 07/02/04 

Date: Fri, 02 Jul 2004 11:18:07 GMT

"Harry" <harald.vanlintel@epfl.ch> wrote in message
news:40e53f21$1@epflnews.epfl.ch...
>
> "Bill Hobba" <bhobba@rubbish.net.au> wrote in message
> news:8y8Fc.74884$sj4.6928@news-server.bigpond.net.au...
> >
> > "John Kennaugh" <JKNG@kennaugh2435hex.freeserve.co.uk> wrote in message
> > news:oU2eAyZiYD5AFwHz@kennaugh2435hex.freeserve.co.uk...
> > > In message <FTmEc.609$XM6.245@attbi_s53>, Robert J. Kolker
> > > <robert_kolker@hotmail.com> writes
> > > >
> > > >
> > > >John Kennaugh wrote:
> > > >
> > > >> It is not a property of waves it is a property of 'waves propagated
> > > >>in a medium' which have a speed which is not dependent on the
> > > >>velocity of the source *because* it is constant w.r.t the
propagating
> > > >>medium.
> > > >
> > > >A wave is any time varying function that satisfies a wave equations.
> > >
> > > but source independence is the property of a propagating medium
> > > independent of what sort of disturbance propagates in it.
> >
> > That theories exist that do not require such a medium trivially
disproves
> > your assertion. You have had this pointed out so often there must be
some
> > mental impairment for you to keep repeating it.
> >
> > Bill
>
> Bill, you obviously misunderstand his argument. Any theory can be made up
> without a physical model that can be pictured, and no doubt that's what he
> meant. Like John, the only physical models for propagation that I know of
> are waves and ballistic emission. Water waves serve as good visual models
> for waves, and bullets for ballistic emission. I know of no such model for
> physical wave propagation that does not require a medium for it to
function
> as a wave. If you do, please refer to it and explain how it can work, it
> will be very helpful!

Maxwell's equations as a model for how EM fields behave do not require a
medium.

Thanks
Bill