I've been looking a little into what there is on-line about descriptive
set theory, a relatively new field.
It seems that with the questions about cardinality and descriptions on
this list, that descriptive set theory (Polish spaces being an
important element) would be useful, if not essential.
Note: forwarded message attached.
---BeginMessage---
Jesse and George:
the cobbler apprentice speaketh:
you, mathematically high-minded savants look for a
primitive realization of 'negative mass' etc, while
you find it natural to use negative numbers. If I was
185lb last week and now 180 lb,
On Thu, Oct 06, 2005 at 08:08:13PM -0400, Jesse Mazer wrote:
This idea looks like it's pretty similar to LeSage's pushing gravity
theory--there's an article on it at
http://en.wikipedia.org/wiki/LeSage_gravity which points out fatal flaws in
the the idea. It's also discussed in the second
Jesse wrote
Well, you're free to define "negative mass" however you
like, of course--but this is not how physicists would use the term.
When you plug negative values of mass or energy into various physics
equations it leads to weird consequences that we don't see in everyday
life, such as the
--- Jesse Mazer [EMAIL PROTECTED] wrote:
John M wrote:
Jesse and George:
SNIP
JeMa:
Well, you're free to define negative mass however
you like, of course--but
this is not how physicists would use the term. When
you plug negative values
of mass or energy into various physics
I'm not really confusing the two, but the idea is so imprecisely put
it probably seems as though I do. The Dirac equation has both positive
and negative energy solutions. The Dirac solution to the negative
energy solutions was that they are all present as an unobservable
Dirac sea. If you pop a
George Levy wrote:
Jesse wrote
Well, you're free to define negative mass however you like, of
course--but this is not how physicists would use the term. When you plug
negative values of mass or energy into various physics equations it leads
to weird consequences that we don't see in
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