Top network posts

• 21 Understanding the definition of nowhere dense sets in Abbott's Understanding Analysis
• 21 To show that the supremum of any collection of lower semicontinuous functions is lower semicontinuous
• 14 Does every uncountable subset of $\mathbb{R}$ have an uncountable closed subset?
• 14 Does this proposition from complex analysis depend on AC?
• 11 Characterizing the continuous functions from $\mathbb{N}$ with the cofinite topology to $\mathbb{R}$
• 10 Can every open set of $\mathbb{R}$ be written as countable union of disjoint open bounded intervals?
• 10 Totally disconnected space that is not $T_2$
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