A Malament–Hogarth (M-H) spacetime, named after David B. Malament and Mark Hogarth, is a relativistic spacetime that possesses the following property: there exists a worldline λ λ and an event p such that all events along λ λ are a finite interval in the past of p, but the proper time along λ λ is infinite. The event p is known as an M-H event.