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The Hahn representation theorem for ℓ-groups in ZFA

Published online by Cambridge University Press:  12 March 2014

D. Gluschankof
D. Gluschankof*
Affiliation:
U.R.A. 753, Équipe De Logique-Mathématique, U.F.R. De Mathématiques, Université Paris7, 2, Pl. Jussieu, 75251 Paris Cedex 05, France, E-mail: gluscha@logique.jussieu.fr
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Extract

In [7] the author discussed the relative force —in the set theory ZF— of some representation theorems for ℓ-groups (lattice-ordered groups). One of the theorems not discussed in that paper is the Hahn representation theorem for abelian ℓ-groups. This result, originally proved by Hahn (see [8]) for totally ordered groups and half a century later by Conrad, Harvey and Holland for the general case (see [4]), states that any abelian ℓ-group can be embedded in a Hahn product of copies of R (the real line with its natural totally-ordered group structure). Both proofs rely heavily on Zorn's Lemma which is equivalent to AC (the axiom of choice).

The aim of this work is to point out the use of non-constructible axioms (i.e., AC and weaker forms of it) in the proofs. Working in the frame of ZFA, that is, the Zermelo-Fraenkel set theory where a non-empty set of atoms is allowed, we present alternative proofs which, in the totally ordered case, do not require the use of AC. For basic concepts and notation on ℓ-groups the reader can refer to [1] and [2]. For set theory, to [11].

Type
Research Article
Information
The Journal of Symbolic Logic , Volume 65 , Issue 2 , June 2000 , pp. 519 - 524
Copyright
Copyright © Association for Symbolic Logic 2000

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References

REFERENCES

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