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- Mathematics Stack Exchange
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- (Un-)Countable union of open sets - Mathematics Stack Exchange
$\begingroup$ A remark: regardless of whether it is true that an infinite union or intersection of open sets is open, when you have a property that holds for every finite collection of sets (in this case, the union or intersection of any finite collection of open sets is open) the validity of the property for an infinite collection doesn't follow from that
- What are some interesting un-intuitive problems in probability aside . . .
there's the rare illness test - despite no symptoms, a man takes a test for an illness that occurs in one in a billion people
- Mnemonic for Integration by Parts formula? - Mathematics Stack Exchange
The Integration by Parts formula may be stated as: $$\\int uv' = uv - \\int u'v $$ I wonder if anyone has a clever mnemonic for the above formula What I often do is to derive it from the Product R
- Prove that $i^i$ is a real number - Mathematics Stack Exchange
Here's a proof that I absolutely do not believe: take its complex conjugate, which is $\bigl({\bar i}\bigr)^{\bar i}=(1 i)^{-i}=i^i$
- probability - If $U\sim U(-1,1)$ and $N\sim N(0,1)$ are independent . . .
Stack Exchange Network Stack Exchange network consists of 183 Q A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
- Newest Questions - Mathematics Stack Exchange
Mathematics Stack Exchange is a platform for asking and answering questions on mathematics at all levels
- Un-curl operator? - Mathematics Stack Exchange
Un-curl operator? Ask Question Asked 14 years, 3 months ago Modified 11 years, 8 months ago Viewed 3k
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