Re: Space-time interval...

Le 13/08/2024 à 16:38, M.D. Richard "Hachel" Lengrand a écrit :

Le 13/08/2024 à 15:35, Python a écrit :

Le 13/08/2024 à 15:31, M.D. Richard "Hachel" Lengrand a écrit :

Le 13/08/2024 à 13:42, Python a écrit :

Le 13/08/2024 à 13:38, Mikko a écrit :

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Until very very recently (you can check on fr.sci.physique) he firmly
believed that ds^2 is always zero, go figure!

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That's not what I actually said.
I was talking about an event occurring in a frame of reference
and whose information reached any observer present in this frame of reference.
For example, a terrestrial observer who observes the explosion of a supernova.
If the explosion took place 15,000 years ago, the observer will note (dl,dt)=(15,000,-15,000)
and therefore ds²=0

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This utterly idiotic! A space-time interval is about TWO events, there
is only one event here.
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I thought you had, at least, understand that an interval is between two
events. I notice that you didn't even understand that.
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You are getting more and more silly every single day old man.

 And the shock of the photons on my retina, is that not an event?

This is utterly irrelevant.
You are a crook Richard.