Given the description of a clock A, as
(1) a set A of all (more than 2) distinct indications of this clock, in no particular order
(where the individual indications contained in set A are denoted below as "AJ", "AQ", "AV" etc.), together with(2) a function tA:A→R
(such that we may speak of set A and function tA together as "a clock, A" at all),
and, in line with Einstein's assertion that:
"All our well-substantiated space-time propositions amount to the determination of space-time coincidences {such as} encounters between two or more {... participants}",
given
- (3) a sufficient suitable account, in no particular order, of participants (such as A, J, or Q) and their encounters (where AJ is A's indication at the encounter of A and J, AQ is A's indication at the encounter of A and Q, and so on) --
How can the order of indications of clock A be derived?
Or to consider the simplest case:
How can be determined whether
AJ was between AQ and AV, or
AQ was between AV and AJ, or
AV was between AJ and AQ
?
Note:
It should not be assumed that clock A was "monotonous";
in other words: it is not an acceptable answer to argue
"if (tA[AV]−tA[AQ])×(tA[AQ]−tA[AJ])>0 then AQ was between AV and AJ".
Another note in response to a comment by Jim:
The encounters (coincidence events) in which the participant took part whose set of indications at those encounters is called A (and who is therefore him/her/itself conveniently called A as well) may be denoted as
"EAJ", "EAQ", "EAV",
among others;
corresponding to the indications "AJ", "AQ", "AV" of A (and, together with function tA, therefore indications of clock A) which had been named explicitly above.
As far as a Lorentzian manifold may be assigned to those events in which A took part (together with additional events, as may be required) and as far as the corresponding Causal structure would be determined, those events in which A took part were all elements of one chronological (or timelike) Curve.
My question is consequently, in other words, whether and how elements of such a chronological (or timelike) curve may be ordered, given their parametrization only by some arbitrary function tA:A→R,
together, of course, with a sufficient suitable account (3, above) of all participants involved, and their encounters, if any, in no particular order.
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