Top network posts

• 22 When must it be sets rather than proper classes, or vice-versa, outside of foundational mathematics?
• 21 Who named it the Snake Lemma?
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• 15 Is $\mathbb R^3$ the square of some topological space?
• 14 Essential uniqueness of the real-analytic structure on $\mathbb R$
• 14 Finite dimensional real division algebras
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