Henno Brandsma
Reputation
42,466
92/100 score
1 22 49
Impact
~355k people reached

# 42,466 Reputation

140 today
 +55 4 hours ago 5 events How many numbers of $7$ digits can be formed with the digit $0,1,1,5,6,6,6$. +30 7 hours ago 3 events Proof verification: Every Euclidean space is complete +25 11 hours ago 2 events For a family of sets $\mathbb{U}$, $\cup_{arbitrary}(\cap_{finite} U)$ $\forall U \in \mathbb{U}$ is stable under $\cap_{finite}$. +10 3 hours ago upvote If (X,T) is perfect and A is a dense subset of X, then A has no isolated points. +10 6 hours ago upvote Prove that F $\in \mathbb{R}$ is closed if and only if every Cauchy sequences contained in F has a limit that is also an element of F. +10 8 hours ago upvote Some subtle points about Homeomorphisms and quotient maps
75 yesterday
 +35 22:03 3 events A set $S$ of a topological space $(X,T)$ is a perfect set iff it's closed and has no isolated points +15 20:38 accept Prob. 5, Sec. 4.1 in Kreyszig's functional analysis book: A finite partially ordered set has a maximal element +15 04:06 accept How do we solve these permutation and combination questions? +10 22:25 upvote Closure of union of two sets
180 2 days ago
 +55 16:26 5 events Metric spaces - $(0, 1)$ and $\mathbb{R}$ are not isometric +35 16:51 3 events Uncountable subset of separable metric space that does not contain a convergent sequence of points +20 18:13 2 events How do we solve these permutation and combination questions? +20 17:42 2 events To show that product $Z=X×Y$ in the product topology is a CW complex +20 11:34 2 events Open interval $(0,1)$ is totally bounded +10 21:07 upvote Prove that a linear mapping between vector spaces is an open mapping iff +10 13:29 upvote For a family of sets $\mathbb{U}$, $\cup_{arbitrary}(\cap_{finite} U)$ $\forall U \in \mathbb{U}$ is stable under $\cap_{finite}$. +10 06:31 upvote What is a finite subcover of $[0,1]^{[0,1]}$?
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