Related papers: A comment on "Computational periodicity as observe…

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This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890

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This paper has been withdrawn by the author. The most updated version can be accessed by arXiv:1806.07290.

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This paper has been withdrawn by Wenji Deng (e-mail: [email protected]) for further modification at Oct. 12, 1998. {PACS: 03.75.Fi, 05.30.Jp.64.60.-i, 32.80.Pj}

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