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• 34 Is the theory of dual numbers strong enough to develop real analysis, and does it resemble Newton's historical method for doing calculus?
• 29 Are Conway's omnific integers the Grothendieck group of the ordinals under commutative addition?
• 26 Elements in $\hat{\mathbb{Z}}$, the profinite completion of the integers
• 25 What "metatheory" did early set theory/logic researchers use to prove semantic results?
• 24 Are Conway's combinatorial games the "monster model" of any familiar theory?
• 21 Skeleton category of the category of skeleton categories?
• 21 Why, historically, did Gödel think CH was false?
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