Stack Exchange

Henno Brandsma

Age: 43

programs in C and Perl, mostly
top accounts reputation activity favorites subscriptions
Top Questions
No questions with score of 5 or more
Top Answers
27
Elementary proof that $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$
math.stackexchange.com

15
What are the issues in modern set theory?
math.stackexchange.com

12
Continuity and Closure
math.stackexchange.com

10
Are the rationals minus a point homeomorphic to the rationals?
math.stackexchange.com

10
Topology and axiom of choice
math.stackexchange.com

10
Continuous functions on a compact set
math.stackexchange.com

10
Does every locally compact second countable space have a non-trivial automorphism?
math.stackexchange.com

10
An open set in a space is homeomorphic to $S^1$. Is the set close?
math.stackexchange.com

9
What's going on with “compact implies sequentially compact”?
math.stackexchange.com

9
imul or shift instruction?
stackoverflow.com

8
Stone Cech compactification of the naturals a cts image of the Cantor set?
math.stackexchange.com

8
$\mathbb{Q}=\mathbb{R}$ in usual topology?
math.stackexchange.com

8
If $C_b(X)$ separable then $X$ is a compact metrizable space
math.stackexchange.com

8
fixed point of a map, closed unit disk to circle
math.stackexchange.com

8
Why does a number like $2^n\bmod 7$ have a repeating pattern?
math.stackexchange.com

8
Ways to add up 10 numbers between 1 and 12 to get 70
math.stackexchange.com

7
Perfect set without rationals
math.stackexchange.com

7
Variation on the Monty Hall Problem
math.stackexchange.com

7
The closed graph theorem
math.stackexchange.com

7
Ternary operator considered harmful?
programmers.stackexchange.com

7
What causes first block of AES decryption to be garbled, even with correct IV?
crypto.stackexchange.com

7
How to attack a classical cipher using known partial plaintext?
crypto.stackexchange.com

6
Useful sufficient conditions for a topological space to be the underlying space of a topological group?
math.stackexchange.com

6
Projection map being a closed map
math.stackexchange.com

6
Why is the Hilbert Cube homogeneous?
math.stackexchange.com

6
Does this make sense $\aleph_0+\aleph_1+\aleph_2$?
math.stackexchange.com

6
Reference for a proof of the Hahn-Mazurkiewicz theorem
math.stackexchange.com

6
About Cardinality in Hausdorff Spaces
math.stackexchange.com

6
Cardinality of a discrete subset
math.stackexchange.com

6
$\operatorname{Spec} (A)$ as a topological space satisfying the $T_0$ axiom
math.stackexchange.com

1 2