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Domain extension in mathematics occurs whenever a given mathematical domain is augmented so as to include new elements. Manders argues that the advantages of important cases of domain extension are captured by the model-theoretic notions of existential closure and model completion. In the specific case of domain extension via ideal elements, I argue, Manders’s proposed explanation does not suffice. I then develop and formalize a different approach to domain extension based on Dedekind’s  Habilitationsrede , to which Manders’s account is compared. I conclude with an examination of three possible stances towards extensions via ideal elements.

Domain Extension and Ideal Elements in Mathematics †