As title says, can anyone explain how to create the set of hyperreal numbers using ultraproduct from the set of real umbers?
2026-03-29 17:27:02.1774805222
how to create the set of hyperreal numbers using ultraproduct
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I’d say that a full explanation is beyond the scope of an answer here. Section $3$ of this PDF is a fairly gentle but very incomplete start; this PDF goes into much more detail and seems to be about as accessible as a thorough treatment is likely to be, though I’ve only skimmed it.