In Einstein's General theory of Relativity, the 6th rule says Causality must be maintained. What is Causality here and what does the rule mean overall?
(this question is not from school or something it's just my personal searching).
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In classical physics, an effect cannot occur before its cause. In Einstein's theory of special relativity, causality means that an effect can not occur from a cause that is not in the back (past) light cone of that event. ... As discussed below, this is a principle that is violated in some theories of modern physics.
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