Chapter 37.5, Problem 37.5TYU

(a) In frame S events P₁ and P₂ occur at the same x-, y-, and z-coordinates, but event P₁ occurs before event P₂. In frame S′, which event occurs first? (b) In frame S events P₃ and P₄ occur at the same time t and the same y- and z-coordinates, but event P₃ occurs at a less positive x-coordinate than event P₄. In frame S′, which event occurs first?