Note 1 to entry: If the displacement four-vector x _ _ AB MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm 0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9ad baGaaiGaciGacmaaceGaaiGacaabaaGcbaWaaWqaaeaacaWG4baaam aaBaaaleaacaqGbbGaaeOqaaqabaaaaa@3669@ of two different events A, B is a space-like position vector, then there exists an inertial frame where A and B occur at the same time in different places.
Note 1 à l’article: Lorsqu’un quadrivecteur déplacement x _ _ AB MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGe aGqipu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9vqaqpepm 0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=xfr=xb9ad baGaaiGaciGacmaaceGaaiGacaabaaGcbaWaaWqaaeaacaWG4baaam aaBaaaleaacaqGbbGaaeOqaaqabaaaaa@3669@ de deux événements différents A, B est un quadrivecteur de genre espace, il existe un référentiel inertiel où A et B se produisent simultanément, mais en des lieux différents.