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Terry Tao: A cheap version of nonstandard analysis. MathOverflow: Does Cheap Nonstandard analysis take place in a topos? (Answer: Yes, but an elementary topos, not a Grothendieck topos). This is partially a summary of Tao’s blog post, partially a small discussion of way LEM fails for cheap nonstandard reals. What is “nonstandard analysis”? In “normal” nonstandard…
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