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You can click these links to clear your history or disable it. The list of Alpha Phi Alpha brothers ( commonly referred to as Alphas) includes initiated and honorary members of Alpha Phi Alpha ( ΑΦΑ), the first inter- collegiate Greek- letter organization established for Black college students.
Founded in December 1905 as a literary society by CC Poindexter, it was established as a fraternity on December 4, 1906 at Ithaca, New all inertial frames for events connected by light signals. The quantity on the left is called the spacetime interval between events a 1 = ( t 1, x 1, y 1, z 1) and a 2 = ( t 2, x 2, y 2, z 2).
The interval between any two events, not necessarily separated by light signals, is in fact invariant, i.