Assertion: time travel | /r/HasSubevent | contradiction
Facets:
value: to constraints
type: CAUSE
value: generically
type: DEGREE
Source sentences:
text: Time travel thus leads to a contradiction: so it is impossible.
text: It is ironic that time travel should lead generically not to contradictions or to constraints (in the normal region) but to underdetermination of what happens in the time travel region by what happens everywhere else (an underdetermination tied neither to a probabilistic dynamics or to a free edge to space-time).