> I have on several occasions wondered
> about the nature of "mass"...
===============
Why?
It's a simple abstract coefficient void of any other "nature".
Postulating proportionality of physical observables "force" F and "acceleration" a, we express it mathematically as F = ma
with help of the proportionality coefficient m.
Thus "m" simplifies the expression, but by itself has no physical, or
any other mysterious "nature".
Georges.
--- On Wed, 12/22/10, einseele <eins...@gmail.com> wrote:
> When you use the word "nature" the
> audience understands two:
>
> The abstraction Nature, and also that thing that the word
> points to
>
> Nature es also an abstraction, even so the John's question
> is valid as
> it is simple to understand the referenced object in his
> sentence
>
> So it is valid to say "the nature of mass", mass and nature
> can be
> abstract concepts, but that does not mean "the nature of
> mass" makes
> no sense.
============
G:
You did not read carefully.
That's exactly what I said, to wit, that the nature of mass is an
abstract, mathematical coefficient void of any physical meaning
(reserved for observables).
What makes no sense is searching in it other mysterious natures,
physical, metaphysical, pataphysical or what not.
For instance, if you asked me, what is the nature of the
"axial vector of magnetic field", I'd answer:
Its physical nature is that of an observable, describing
counter-clockwise rotation of magnetic angular momentum.
Its mathematical nature is that of an anti-symmetric tensor of rank 2.
It happens to have in 3D SPACE 3 independent components, which makes
it similar to a vector and allows to describe it in elementary
handbooks as "axial vector", or "pseudo-vector", which, strictly
speaking are misnomers.
What makes no sens is speculation about the pataphysical nature
and reasons of the counter-clockwise structure of our "world"
and about its clockwise structured shadow counter-world.
And that's mutatis mutandis what John seems to do, looking for
pataphysical nature of mass.
Georges.
==============
--- On Thu, 12/23/10, einseele <eins...@gmail.com> wrote:
==============
G old:
What makes no sens is speculation about the pataphysical nature
and reasons of the counter-clockwise structure of our "world"
and about its clockwise structured shadow counter-world.
===========
E:
=============
G:
Thanks very much indeed. I'm gratified and if I answer only now, it's
due to a catastrophe: the cats have pissed on my keyboard which
started displaying some strange, rather poetic things having however
nothing to do with what I tried to type. So I had to wait and steal
enough coins from the cats' milk savings box to by a new one.
Back to poetry, most great scientists were also artists in some way,
often mixing it up with their science. Outside his science Einstein
played violin, but within it considered intuition as 90% of physics,
maths making the vague intuition more precise. He was choosing
his axioms mainly by esthetic criteria and wanted theories to be
beautiful.
Our discussion started with the abstract "nature" of mass.
Now, here is what Feynman says about the "nature" of another
abstraction, to wit, energy. If that's not poetry then it's
well imitated:
***
There is a fact, or if you wish, a law governing all natural phenomena that are known to date. There is no known exception to this law – it is exact so far as we know. The law is called the conservation of energy.
It states that there is a certain quantity, which we call “energy,” that does not change in the manifold changes that nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says there is a numerical quantity which does not change when something happens.
It is not a description of a mechanism, or anything concrete; it is a strange fact that when we calculate some number and when we finish watching nature go through her tricks and calculate the number again, it is the same.
It is important to realize that in physics today, we have no knowledge of what energy “is.” We do not have a picture that energy comes in little blobs of a definite amount. It is not that way. It is an abstract thing in that it does not tell us the mechanism or the reason for the various formulas.
***
As for literature, I play with it in my idle moments and some of the
results may be seen in
http://findgeorges.com/ROOT/WRITINGS/LITERATURE/
Most are in French and if you don't read it, have a look at
PASSION WEEK and EXECUTIVE BATH POLISHERS.
Cheers
Georges.