kappa-bounded Exponential-Logarithmic Power Series Fields

Details kappa-bounded Exponential-Logarithmic Power Series Fields kappa-bounded Exponential-Logarithmic Power Series Fields

2005-12-10

arxiv.org/abs/math/0512220v1

Annals of Pure and Applied Logic 136(2005):284-296

Mathematics

Logic

Scientific paper

In math.AC/9608214 it was shown that fields of generalized power series cannot admit an exponential function. In this paper, we construct fields of generalized power series with bounded support which admit an exponential. We give a natural definition of an exponential, which makes these fields into models of real exponentiation. The method allows to construct for every kappa regular uncountable cardinal, 2^{kappa} pairwise non-isomorphic models of real exponentiation (of cardinality kappa), but all isomorphic as ordered fields. Indeed, the 2^{kappa} exponentials constructed have pairwise distinct growth rates. This method relies on constructing lexicographic chains with many automorphisms.

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