Similarly, the past of P can be defined as the set of all events
from which it is possible to reach the event
P traveling at or below the speed of light.
It is thus the set of events that can affect what happens at P.
The events that do not lie in the future or
past of P are said to lie in the elsewhere of P.
— Stephen Hawking, A Brief History of Time
Similarly, the past of P can be defined as the set of all events
from which it is possible to reach the event
P traveling at or below the speed of light.

It is thus the set of events that can affect what happens at P.
The events that do not lie in the future or
past of P are said to lie in the elsewhere of P.

— Stephen Hawking, A Brief History of Time

Notes

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