## La théorie d’un anneau de polynomes.(French)Zbl 0563.12027

We give four possible definitions of the weak second order theory of a model and prove the interpretability of one in another. We prove the existence of $$2^{\aleph_ 0}$$ countable fields having the same weak second order theory. We give sketches of proofs for the following: for any nontrivial commutative totally orderable monoid G, the weak second order theory of a field F is interpretable in the theory of the polynomial ring F[G], uniformly for any infinite field F; the same and the converse interpretabilities are true for all fields, under some more conditions on G. We end with some results about the models of the theory of a polynomial ring. More detailed proofs will appear in J. Symb. Logic.

### MSC:

 12L12 Model theory of fields 03B15 Higher-order logic; type theory (MSC2010) 03C60 Model-theoretic algebra
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### References:

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