Causal processes that run backwards in time are constrained by consistency conditions (Novikov's self-consistency principle) that physically prohibit interventions that would generate paradoxes.
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A rule proposed by physicist Igor Novikov stating that if you travel back in time, you can only do things that are already part of history—you can't create paradoxes or change what already happened.
paradox(R. M. Sainsbury's definition, presented as a target of criticism)
An apparently unacceptable conclusion derived by apparently acceptable reasoning from apparently acceptable premises