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This tag is used if a reference is needed in a paper or textbook on a specific result.

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"Archimedeanising" an ordered field

Yes, the map is sometimes called the standard part map, and it turns out that one map define it in general for a group in an o-minimal structure. See here, for example. Regarding the splitting, if it …
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10 votes

Non standard Algebraic Topology

As mentioned in the comments, the actual topology on the non-standard extension can be quite nasty. This is illustrated for example in the first set of problems in these notes. A solution is to replac …
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