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replaced http://math.stackexchange.com/ with https://math.stackexchange.com/

edited Apr 13, 2017 at 12:19

Terence Tao's cheap nonstandard analysis can be interpreted as taking place in a topos related to the topos $\text{Set}^{\mathbb{N}}$ of sets indexed by the natural numbers; see this math.SE question for details.

answered Dec 18, 2013 at 22:04

Qiaochu Yuan

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