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Questions about mathematics which don't fall into the other arXiv categories. If you have a general question about mathematics but it is not research level, it's off-topic but it might be welcomed on Mathematics Stack Exchange.

3 votes

17 camels trick

In homotopy theory, this happens when you use stable splittings of spaces to analyze homotopy types. For example, (writing $X_+$ for $X$ with a disjoint basepoint), $X_+ \not\simeq X \vee S^0$ (as po …
14 votes

Proof synopsis collection

Toda's Proof of the Bott Periodicity Theorem: The homology algebras of $\Omega SU$ and $BU$ are isomorphic: they are polynomial algebras on the image of the maps induced by certain maps $f: \mathbb{ …
7 votes

The impact of large cardinals in mathematics

I guess this is relevant to Question 4: In the paper Implications of large-cardinal principles in homotopical localization. Adv. Math. 197 (2005), no. 1, 120–139. by Casacuberta, Carles; Scevenel …
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