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Talk:Dedekind–MacNeille completion

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It does not seem correct to say that this is self-dual, but rather that it preserves or respects duality. I looked up Birkoff's paper and did not find any mention of "self-dual", but only a mention of "preserving".
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It may be worth pointing out that the hyperreals are a (proper) subset of the Dedekind–MacNeille completion of the hyperrationals.
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