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Peter Elias's user avatar
Peter Elias's user avatar
Peter Elias
  • Member for 12 years, 2 months
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6
How do we avoid circularity when we build a structure for ZFC?
Sep 26, 2012
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21
Is $\mathbb{R}/\mathord{\sim}$ a Hausdorff space if $\{(x,y)\!:x\sim y\}$ is a closed subset of $\mathbb{R}\times\mathbb{R}$?
13
Is $\mathbb{R}/\mathord{\sim}$ a Hausdorff space if $\{(x,y)\!:x\sim y\}$ is a closed subset of $\mathbb{R}\times\mathbb{R}$?
7
Is every $F_{\sigma\delta}$-set a set of points of convergence of a sequence of continuous functions?
7
Are there products in the category of $\sigma$-algebras and (reversed) $\sigma$-homomorphisms?
7
Which vector spaces are algebraic dual spaces?