Tour
About Us
Meta
Loading…
Log in
current community
Stack Exchange
chat
Meta Stack Exchange
your communities
Sign up
or
log in
to customize your list.
more stack exchange communities
company blog
Stack Exchange
All Sites
Top Users
Digests
Henno Brandsma
the Netherlands
http://at.yorku.ca/cgi-bin/bbqa
Dutch topologist, now working in other fields.
top
accounts
reputation
activity
bookmarks
subscriptions
Top Questions
58
votes
Non-homeomorphic spaces that have continuous bijections between them
gn.general-topology
big-list
examples
asked Jul 5 '10 at 20:03
mathoverflow.net
9
votes
Relatively countably compact subsets without countably compact closure.
gn.general-topology
asked Jul 5 '10 at 20:09
mathoverflow.net
Top Answers
88
How secure is Chrome storing a password?
security.stackexchange.com
87
Elementary proof that $\mathbb{R}^n$ is not homeomorphic to $\mathbb{R}^m$
math.stackexchange.com
73
A map is continuous if and only if for every set, the image of closure is contained in the closure of image
math.stackexchange.com
63
Projection map being a closed map
math.stackexchange.com
61
Is $\mathbb R^3$ the square of some topological space?
mathoverflow.net
49
Prove $\limsup\limits_{n \to \infty} (a_n+b_n) \le \limsup\limits_{n \to \infty} a_n + \limsup\limits_{n \to \infty} b_n$
math.stackexchange.com
38
Show that the countable product of metric spaces is metrizable
math.stackexchange.com
35
Proof that product topology of subspace is same as induced product topology
math.stackexchange.com
32
Quick proofs of hard theorems
mathoverflow.net
28
Why do we need topological spaces?
math.stackexchange.com
25
What are the issues in modern set theory?
math.stackexchange.com
23
No. of possible dense subsets of a metric space
math.stackexchange.com
22
A topology that is finer than a metrizable topology is also metrizable?
math.stackexchange.com
22
Any open subset of $\Bbb R$ is a countable union of disjoint open intervals
math.stackexchange.com
21
Is every manifold a metric space?
math.stackexchange.com
21
Make $2^8 + 2^{11} + 2^n$ a perfect square
math.stackexchange.com
21
Perfect set without rationals
math.stackexchange.com
20
What is the reason for the term “zero dimensional” in the context of topology?
math.stackexchange.com
20
Are the rationals minus a point homeomorphic to the rationals?
math.stackexchange.com
19
Locally Constant Functions on Connected Spaces are Constant
math.stackexchange.com
19
Why don't we define neighbourhoods to be open sets?
math.stackexchange.com
19
Can Cantor set be the zero set of a continuous function?
mathoverflow.net
18
Advantage of the more general notion of “neighborhoods” in topology
math.stackexchange.com
18
What is your favorite proof of Tychonoff's Theorem?
mathoverflow.net
18
A quotient of a locally connected space is locally connected
math.stackexchange.com
17
Why is the lower limit topology not metrizable?
math.stackexchange.com
17
Why is PuTTYgen-created RSA public exponent(e) not in {3,17,65537}?
crypto.stackexchange.com
17
Is this statement true: a set is open if every point has a closed ball contained inside of the set
math.stackexchange.com
17
What's going on with “compact implies sequentially compact”?
math.stackexchange.com
17
How many orders of infinity are there?
mathoverflow.net
1
2
3
4
5
…
10
next
Stack Exchange works best with JavaScript enabled