Bisimulation on speed: Lower time bounds

Gerald Lüttgen; Walter Vogler

RAIRO - Theoretical Informatics and Applications (2010)

  • Volume: 39, Issue: 3, page 587-618
  • ISSN: 0988-3754

Abstract

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More than a decade ago, Moller and Tofts published their seminal work on relating processes, which are annotated with lower time bounds, with respect to speed. Their paper has left open many questions regarding the semantic theory for the suggested bisimulation-based faster-than preorder, the MT-preorder, which have not been addressed since. The encountered difficulties concern a general compositionality result, a complete axiom system for finite processes, a convincing intuitive justification of the MT-preorder, and the abstraction from internal computation. This article solves these difficulties by developing and employing a novel commutation lemma relating the sequencing of action and clock transitions in discrete-time process algebra. Most importantly, it is proved that the MT-preorder is fully-abstract with respect to a natural amortized preorder that uses a simple bookkeeping mechanism for deciding whether one process is faster than another. Together these results reveal the intuitive roots of the MT-preorder as a faster-than relation, while testifying to its semantic elegance. This lifts some of the barriers that have so far hampered progress in semantic theories for comparing the speed of processes.

How to cite

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Lüttgen, Gerald, and Vogler, Walter. "Bisimulation on speed: Lower time bounds." RAIRO - Theoretical Informatics and Applications 39.3 (2010): 587-618. <http://eudml.org/doc/92779>.

@article{Lüttgen2010,
abstract = { More than a decade ago, Moller and Tofts published their seminal work on relating processes, which are annotated with lower time bounds, with respect to speed. Their paper has left open many questions regarding the semantic theory for the suggested bisimulation-based faster-than preorder, the MT-preorder, which have not been addressed since. The encountered difficulties concern a general compositionality result, a complete axiom system for finite processes, a convincing intuitive justification of the MT-preorder, and the abstraction from internal computation. This article solves these difficulties by developing and employing a novel commutation lemma relating the sequencing of action and clock transitions in discrete-time process algebra. Most importantly, it is proved that the MT-preorder is fully-abstract with respect to a natural amortized preorder that uses a simple bookkeeping mechanism for deciding whether one process is faster than another. Together these results reveal the intuitive roots of the MT-preorder as a faster-than relation, while testifying to its semantic elegance. This lifts some of the barriers that have so far hampered progress in semantic theories for comparing the speed of processes. },
author = {Lüttgen, Gerald, Vogler, Walter},
journal = {RAIRO - Theoretical Informatics and Applications},
keywords = {Asynchronous systems; timed process algebra; lower time bounds; faster-than relation; Moller-Tofts preorder; bisimulation.; MT-preorder; faster-than preorder; axiomatization; precongruence},
language = {eng},
month = {3},
number = {3},
pages = {587-618},
publisher = {EDP Sciences},
title = {Bisimulation on speed: Lower time bounds},
url = {http://eudml.org/doc/92779},
volume = {39},
year = {2010},
}

TY - JOUR
AU - Lüttgen, Gerald
AU - Vogler, Walter
TI - Bisimulation on speed: Lower time bounds
JO - RAIRO - Theoretical Informatics and Applications
DA - 2010/3//
PB - EDP Sciences
VL - 39
IS - 3
SP - 587
EP - 618
AB - More than a decade ago, Moller and Tofts published their seminal work on relating processes, which are annotated with lower time bounds, with respect to speed. Their paper has left open many questions regarding the semantic theory for the suggested bisimulation-based faster-than preorder, the MT-preorder, which have not been addressed since. The encountered difficulties concern a general compositionality result, a complete axiom system for finite processes, a convincing intuitive justification of the MT-preorder, and the abstraction from internal computation. This article solves these difficulties by developing and employing a novel commutation lemma relating the sequencing of action and clock transitions in discrete-time process algebra. Most importantly, it is proved that the MT-preorder is fully-abstract with respect to a natural amortized preorder that uses a simple bookkeeping mechanism for deciding whether one process is faster than another. Together these results reveal the intuitive roots of the MT-preorder as a faster-than relation, while testifying to its semantic elegance. This lifts some of the barriers that have so far hampered progress in semantic theories for comparing the speed of processes.
LA - eng
KW - Asynchronous systems; timed process algebra; lower time bounds; faster-than relation; Moller-Tofts preorder; bisimulation.; MT-preorder; faster-than preorder; axiomatization; precongruence
UR - http://eudml.org/doc/92779
ER -

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