Abstract
To make a decision, we need to compare the values of quantities. In many practical situations, we know the values with interval uncertainty. In such situations, we need to compare intervals. Allen’s algebra describes all possible relations between intervals on the real line which are generated by the ordering of endpoints; ordering relations between such intervals have also been well studied. In this paper, we extend this description to intervals in an arbitrary partially ordered set (poset). In particular, we explicitly describe ordering relations between intervals that generalize relation between points. As auxiliary results, we provide a logical interpretation of the relation between intervals, and extend the results about interval graphs to intervals over posets.
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Notes
Note that this is almost always true, in that endpoint equality also has to be taken into account, yielding intervals which are equal at one endpoint comparable in both orders.
The authors are thankful to an anonymous referee for this interesting suggestion.
The authors are thankful to an anonymous referee for this interesting suggestion.
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Acknowledgments
This work was partly supported by a CONACyT scholarship, by the National Science Foundation grants HRD-0734825 and DUE-0926721, and by Grant 1 T36 GM078000-01 from the National Institutes of Health. The authors are thankful to all the participants of the Dagstuhl 2011 seminar Uncertainty Modeling and Analysis with Intervals: Foundations, Tools, Applications for valuable discussions, and to the anonymous referees for useful suggestions.
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Communicated by V. Kreinovich.
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Zapata, F., Kreinovich, V., Joslyn, C. et al. Orders on intervals over partially ordered sets: extending Allen’s algebra and interval graph results. Soft Comput 17, 1379–1391 (2013). https://doi.org/10.1007/s00500-013-1010-1
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DOI: https://doi.org/10.1007/s00500-013-1010-1