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Σ-Presentations of the Ordering on the Reals

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Algebra and Logic Aims and scope

We prove the nonexistence of universal Σ-presentable linear orderings as well as the effective infinity of the class of Σ-presentations of the natural order on ℝ over an admissible set ℍ\( \mathbb{F} \)(ℝ).

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Correspondence to A. S. Morozov.

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*Supported by RFBR (project No. 11-01-00236) and by the Federal Program “Scientific and Scientific-Pedagogical Cadres of Innovative Russia” for 2009-2013 (project No. 8227).

Translated from Algebra i Logika, Vol. 53, No. 3, pp. 340-371, May-June, 2014.

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Morozov, A.S. Σ-Presentations of the Ordering on the Reals. Algebra Logic 53, 217–237 (2014). https://doi.org/10.1007/s10469-014-9285-6

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  • DOI: https://doi.org/10.1007/s10469-014-9285-6

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