Related papers: E_0-dilation of pairs of quantized convolution sem…

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This paper has been withdrawn by the author due to a gap in the proof of Lemma 3.4

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This paper is withdrawn because the results in the paper are included in a paper to be published in Mathematical and Computer Modelling.

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This paper has been withdrawn by the authors. We have discovered an error in the evaluation of the diagram, which invalidates our conclusion.

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This paper has been withdrawn since we combine this paper with math.AC/0503685. All contents of the paper have been moved to math.AC/0503685.

This paper has been withdrawn by the author, because it is now part of an enlarged version entitled "Time functions as utilities" arXiv:0909.0890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This paper has been withdrawn. See quant-ph/9806031 for a discussion.

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This paper has been withdrawn by the author, due to possible counter-examples.

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This paper has been withdrawn while the author verifies the literature.

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