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From: Python <python@invalid.org>
Newsgroups: sci.physics.relativity
Subject: Re: Space-time interval (2)
Date: Mon, 12 Aug 2024 21:06:03 +0200
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Le 12/08/2024 à 19:35, M.D. Richard "Hachel" Lengrand a écrit :
> The notion of space-time interval should be abandoned because it is 
> complex and leads to nothing, except final errors.

This is your typical mantra : you read a few popular science stuff,
too quickly and nothing more, then you fail to understand the point
and put up some fancy idea out of your *ss and as you are a stuffed
shirt pompous imbecile you will brag about it for years.

Could you consider once to actually take time to *read* papers,
articles, courses, whatever and *think* instead of acting like
a wanker with your very small pee-pee?

> What is the space-time interval?
> A metric, measured in meters.

Meters, furlong, inches, it doesn't matter.

It is a number associated to a pair of events with dimension
of a length.

> It is mostly an abstract thing that is not very useful.

"abstract" means "Richard Lengrand does not understand". For the
rest of us abstraction is a virtue of intelligence.

> So we set ds²=dl²-c²t².
> Why and for WHAT?
> For nothing.
> For fun.

No, because an invariant scalar quantity is what allow to do
geometry on top of coordinates systems.

> Hachel notation is much more practical, because it does not need the 
> notion of complexes to establish a perfect Pythagoreanism.

"pythagoreanism" is a meaningless word.

There is no need for complex numbers when it comes to space-time
interval. But even if it would, what the problem? You do have issues
with basic math, including complex numbers, this is none of our
business.

> [snip nonsensical wanking]

> Finally, what is ds²? It is just -c².Tr²

No! ds^2 = c^2 dt^2 - dl^2. For some kind of pairs of event
it could be equal to c^2 dt^2 but not for all. I tried (in vain)
to explain this to you on f.s.p.

> Let's pose Tr²=-ds².c² and everything becomes much simpler and much more 
> practical.

It is not simpler, it is not practical. And it is FALSE.


> Simplicity is disconcerting.
> 
> In general, we don't like it too much.

No we don't like contradictions and fallacies. You do.