Henno Brandsma

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Got a PhD in topology in 98, now a cryptographer.


256 Answers

newest activity votes
2
If each component of a Cartesian product is homeomorphic to another space, are the Cartesian products homeomorphic
2
why must a normed space homeomorphic to a complete metric space be complete?
2
Interior of arbitrary products
2
Some compactness related property
2
A property similar to countable tightness
2
Is $\mathbb{R}^{\infty}$ homeomorphic to $\mathbb{R}^{\infty}\setminus\{0\}$?
2
Why are ordered spaces normal? [collecting proofs]
2
Another question on hereditarily lindelof space
2
showing subset of $l^2$ closed
2
Topology: Continuous Functions
2
A nbhood of an accumulation point contains infinitely many points
2
Is the convergence in “the topology of pointwise convergence” for sequences or nets?
2
Definitions and coincidences of the topology of pointwise convergence and the uniformity of uniform convergence
2
How to show the space is Frechet?
2
If $\mathcal{B}$ in $X$ converges to $x$, it accumulates at $x$ and if $X$ is Hausdorff, $x$ is a unique point of accumulation.
2
Hausdorff spaces and convergence
2
Suppose $X_1,X_2$ form a closed cover of $X$ and the $U \cap X_i$ are open. Is $U$ open?
2
Integration by parts : $\int 2x \cos(x^2 + 1) dx$
2
Infimum of distance in compact metric spaces.
2
Combinatorics. Please explain me how to do it.
2
Base for a topology, euclidean topology and Hausdorff
2
Proof that final topology with a certain property is unique
2
Tychonoff cube $I^{m}$
2
Properties shared between locally compact spaces and their one point compactifications.
2
a problem on fixed point on different sets under continuous mapping
2
A problem on properties of Hausdorff space
2
About Countable Basis
2
How to prove that every compact subspace of the sorgenfrey line is countable?
2
The application of a lemma on normal topological spaces
2
What's the relation betwen “continuously symmetrizable” and the “diagonal property”?
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