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Saturated models of Peano arithmetic
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AbstractWe study reducts of Peano arithmetic for which conditions of saturation imply the corresponding conditions for the whole model. It is shown that very weak reducts (like pure order) have such a property for κ-saturation in every κ ≥ ω1. In contrast, other reducts do the job for ω and not for κ > ω1. This solves negatively a conjecture of Chang.
Title: Saturated models of Peano arithmetic
Description:
AbstractWe study reducts of Peano arithmetic for which conditions of saturation imply the corresponding conditions for the whole model.
It is shown that very weak reducts (like pure order) have such a property for κ-saturation in every κ ≥ ω1.
In contrast, other reducts do the job for ω and not for κ > ω1.
This solves negatively a conjecture of Chang.
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