Henno Brandsma

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 +45 21:53 4 events If two sets have the same cardinality, do their power sets have the same cardinality? +45 11:57 4 events How will Urysohn metrization theorem not hold if there is no countable basis, i.e. all basis are uncountable +35 17:51 3 events Probability of rolling 6 dice with 1,2 & 3 +35 17:40 3 events Number of ways to construct a 12 characters word with only 2 letters (including restrictions) +35 05:44 3 events How to show that a regular space with non-countable basis is not normal +20 21:57 2 events Question about terminology on topology. +15 22:28 accept Cantor's diagonal argument and alternate representations of numbers +15 19:41 accept $[0,1]$ is commonly called the unit interval - is there a similar term for $[-1,1]$? +15 16:27 accept Probability of choosing different colors when there are more colors than balls per color +10 16:13 upvote Prove that $\mathcal{T}_1 \subset \mathcal{T}$ with $\mathcal{T}_1$ is the standard topology on $\mathbb{R}$.
80 2 days ago
 +60 19:31 6 events $[0,1]$ is commonly called the unit interval - is there a similar term for $[-1,1]$? +10 18:52 upvote Nagata-Smirnov vs. Urysohn metrization theorems - an example? +10 09:52 upvote Continuous function on a closed set is determined by its values on a countable subset
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