Re: [ANN] SR/InertialFrames v2.2.1

On 26/05/2025 02:41, Ross Finlayson wrote:

Hmm..., "retro-causation", ..., not causation?

Causation, too: but nobody seems bothered by that. :)
No, seriously, the fact with the Twins is (and this can
be shown with diagrams!) that, assuming you are the one
who travels of us two: you (the individual I am talking
to here and now) will meet an older "me" when you get
back (not the me you are talking to here and now); while
I will meet a younger "you" when, at a later (proper)
time than that, "you" get back to me!
Namely, there are *two* (in proper time!) separate
rendezvous "events" (the standard terminology is rather
a hindrance), and here is the Twin Paradox: what if I
decide to kill myself in between the (proper) time you
get back (the first rendezvous), where you get to see
"me", and the (later, proper) time when I am supposed
to get to my rendezvous with "you"?
Coherence conditions is my best bet, as opposed to
everything goes, as that immediately makes no sense:
ultimately in a quantum mechanical form (information),
but already geometrically because *zero* (proper)
distance along a light-like path I take for serious:
zero distance is direct contact, and even sameness...
-Julio