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The causal boundary of string propagation -- defined as the hypersurface in loop space bordering the timelike (spacelike) domains in which two successive measurements of the string field do (do not) interfere with one another -- is argued to be 0=\ d\\ (\ X (\) \) ² = \\=-\^\ \ x^\-\\ x\ \. Some possible consequences are discussed.
Emil J. Martinec (Fri,) studied this question.
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