Mathematics
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Stefan

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 8 years, 11 months
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  • Last seen Jun 10 at 11:12

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31 Turning coins on a chessboard Jul 9 '17
10 How does $3^n-1+2 \cdot 3^n$ evaluate to $3^{n+1}-1$? Mar 20 '13
9 Prove that $H=0$ or $H=\mathbb{Q}$ Apr 23 '13
9 Prove that if $A$ is invertible matrix then $AA^T$ and $A^T A$ are also invertible. Sep 20 '12
8 How does $2^{k+1} = 2 \times 2^k$? Oct 30 '12
7 How do I calculate $\lim_{x\rightarrow 0} x\ln x$ Feb 14 '13
7 Suppose that $f$ is a differentiable function such that $f(g(x)) = x$ and $f^\prime(x) = 1+ [f(x)]^2$. Show that $g^\prime(x) = \frac{1}{1+x^2}$. Mar 17 '15
6 Derivative of $\arctan \sqrt x$ Mar 22 '13
5 Why does $\bigcup_{X \in \mathscr{P}(\mathbb{N})}X = \mathbb{N}$, instead of $\mathscr{P}(\mathbb{N})?$ Feb 24 '13
5 Limit $\lim_{n\to\infty}n\frac{\sin\frac{1}{n}-\frac{1}{n}}{1+\frac{1}{n}}$ Dec 2 '13
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