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Subject: =?UTF-8?Q?Re=3A_De_la_relativit=C3=A9_des_distances?=
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Le samedi 10 juin 2023 =C3=A0 21:12:03 UTC+2, Julien Arlandis a =C3=A9crit=
=C2=A0:
> Je sais repr=C3=A9senter une trajectoire spatiale mais comment montrer su=
r un=20
> graphe que la trajectoire spatio-temporelle d'un rayon de lumi=C3=A8re es=
t=20
> nulle, il doit bien exister une repr=C3=A9sentation g=C3=A9om=C3=A9trique=
 mais je ne=20
> la connais pas.
>=20

Sur un graphe en cercle, on peut voir que la vitesse temporelle de la lumi=
=C3=A8re est nulle.