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1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeJan 4th 2018
   • PermaLink
   Author: Urs
   Format: MarkdownItexat _[[S-matrix]]_ and elsewhere is reference to the "[[causal order]]"-relation, the relation saying that for a pair $(S_1,S_2)$ of subsets of a spacetime, $S_1$ does not intersect the past of $S_2$, or equivalently that $S_2$ does not intersect the future of $S_1$. (Following a suggestion by Arnold Neumaier, a neat suggestive notation for this is $S_1 {\vee\!\!\!\wedge} S_2$, which I have been implementing now at _[[S-matrix]]_.) I am starting to give this concept its own entry, currently titled "[[causal order]]"; but what's good terminology? This relation ${\vee\!\!\!\wedge}$ is not really an [[ordering]], since it is not transitive. It would seem tempting to say "causal relation", but googling for this term shows that has an different established meaning.

   at S-matrix and elsewhere is reference to the “causal order“-relation, the relation saying that for a pair of subsets of a spacetime, does not intersect the past of , or equivalently that does not intersect the future of .

   (Following a suggestion by Arnold Neumaier, a neat suggestive notation for this is , which I have been implementing now at S-matrix.)

   I am starting to give this concept its own entry, currently titled “causal order”; but what’s good terminology?

   This relation is not really an ordering, since it is not transitive. It would seem tempting to say “causal relation”, but googling for this term shows that has an different established meaning.