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WimC

http://wimcouwenberg.wordpress.com

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141
Why is $\frac{987654321}{123456789} = 8.0000000729?!$
math.stackexchange.com

80
Is there a simple, constructive, 1-1 mapping between the reals and the irrationals?
math.stackexchange.com

61
Prove that $\log(n) = O(\sqrt{n})$
math.stackexchange.com

60
Can every proof by contradiction also be shown without contradiction?
math.stackexchange.com

38
If $n\ne 4$ is composite, then $n$ divides $(n-1)!$.
math.stackexchange.com

35
Making 400k random choices from 400k samples seems to always end up with 63% distinct choices, why?
math.stackexchange.com

33
How many positive integers $< 1{,}000{,}000$ contain the digit $2$?
math.stackexchange.com

32
How would you explain a tensor to a computer scientist?
math.stackexchange.com

29
Please prove that the Probability Mass Function (in Binomial Distribution) is less than 1.
math.stackexchange.com

27
Why does $ \int_0^1 \lceil { x\sin({1 \over x})} \rceil \,dx = 1 - \frac{\log(4)}{2\pi} $?
math.stackexchange.com

23
Proving that $\sin x \ge \frac{x}{x+1}$
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23
Mapping half-plane to unit disk?
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22
Why did Nintendo name its console the "Famicom"?
retrocomputing.stackexchange.com

22
Proof that a function with a countable set of discontinuities is Riemann integrable without the notion of measure
math.stackexchange.com

21
How to efficiently generate five numbers that add to one?
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21
Integral $\int_{0}^{1}\ln x \, dx$
math.stackexchange.com

19
Calculate sum of $\sum_{n=1}^{\infty}(-1)^n\frac{\ln n}{n}$
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18
101 positive integers placed on a circle
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17
Limit of complex function
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17
Find $\sum_{n=1}^\infty {\frac {f(n)} {n(n+1)}}$ where $f(n)$ is the number of $1$s in $n$'s binary expansion
math.stackexchange.com

17
How do we check if a polynomial is a perfect square?
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17
What's the most elementary way to solve this trigonometric problem?
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17
Covariance matrix as linear transformation
stats.stackexchange.com

17
How does Space Invaders on the Atari 2600 display all the aliens?
retrocomputing.stackexchange.com

15
Disproving an "almost true" trigonometric identity
math.stackexchange.com

15
Proving that $\lim_{z \to 0} \frac{\bar{z}}{z}$ does not exist
math.stackexchange.com

14
How can I evaluate this improper integral?
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14
Are there any simple ways to see that $e^z-z=0$ has infinitely many solutions?
math.stackexchange.com

14
A bound on a sum of five sines
math.stackexchange.com

14
Explaining a Fibonacci
math.stackexchange.com

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