Mathematics
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Stefan

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

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  • Member for 7 years
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  • Last seen Jul 19 at 10:45

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Top posts (104) All Questions Answers | Votes Newest

30 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 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 Prove that $H=0$ or $H=\mathbb{Q}$ Apr 23 '13
6 Derivative of $\arctan \sqrt x$ Mar 22 '13
6 How do I calculate $\lim_{x\rightarrow 0} x\ln x$ Feb 14 '13
6 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
5 What is the difference between $f(x_1) \geq f(x_2)$ and $(f(x_1) > f(x_2))$? Nov 7 '17
5 Why does $\bigcup_{X \in \mathscr{P}(\mathbb{N})}X = \mathbb{N}$, instead of $\mathscr{P}(\mathbb{N})?$ Feb 24 '13
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