352 reputation
1515
bio website balpha.de
location Berlin, Germany
age 34
visits member for 4 years, 5 months
seen Dec 15 at 9:34

My name is Benjamin Dumke-von der Ehe. I am Stack Overflow Valued Associate #00007, which is just a confusing way of saying that I work as a developer for Stack Exchange.

I am @balpha on Twitter. My blog's "about" page explains the origin of my user name.

I am the creator of Unicornify, the service that gives you these lovable creatures:

I also created Lyfe, a small library adding yield-based generators to JavaScript, and Not a Real Question, a little game that's played with data from various Stack Exchange sites.

I sometimes have a strange sense of humor, but I also like to explain things I fix, break, care about, or come up with.


Jul
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awarded  Great Answer
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awarded  Excavator
Jul
2
revised Chance of getting a date
work around mathjax bug
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awarded  Constituent
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awarded  Convention
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awarded  Good Answer
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awarded  Yearling
Jul
12
comment A property of subsets of topological spaces
Interesting, in that case I'll have to check my original proof for errors. My topology has become quite rusty, so give my some time :)
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awarded  Announcer
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awarded  Quorum
Mar
12
revised A property of subsets of topological spaces
typo
Mar
12
comment A property of subsets of topological spaces
@S.L. I expanded my question with some context.
Mar
12
revised A property of subsets of topological spaces
clarify Lebesgue condition
Mar
12
awarded  Nice Question
Mar
12
revised A property of subsets of topological spaces
add some additional information
Mar
8
comment Factorial of 0 - a convenience?
I've always felt comfortable with $0!=1$, because $(n-1)!=\frac{n!}{n}$
Mar
8
comment A property of subsets of topological spaces
@S.L.: Requiring this property of the set of $X$'s isolated points in addition to $X$ satisifying the Lebesgue condition is necessary and sufficient for compactness; that was the reason for defining it. I'm just not sure if this fact is interesting at all; hence the question.
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8
awarded  Promoter
Mar
6
comment A property of subsets of topological spaces
@HennoBrandsma: Actually, "empty interior" is sufficient -- $Y\setminus N$ needs to be finite, not necessarily $X\setminus N$.
Mar
6
awarded  Commentator