Assertion: krasnikov tube | /r/CapableOf | present problem
Facets:
value: with causality
type: OTHER
Source sentences:
text: While one Krasnikov tube can be seen to present no problems with causality, it was proposed by Allen E. Everett and Thomas A. Roman of Tufts University that two Krasnikov tubes going in opposite directions can create a closed timelike curve, which would violate causality.