Mathematics
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Ragnar's user avatar
Ragnar's user avatar
Ragnar
  • Member for 10 years, 1 month
  • Last seen more than a month ago
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About

Mathematics and physics bachelor student at Utrecht University.

I participated in the 2011 (honourable mention) and 2013 (bronze) IMO. Got 3rd place (Gold medal) at the 2015 NWERC, which qualified me and my team Curiously Recurring for the 2016 ACM-ICPC world finals.

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All Questions Answers
Score Newest
answer
43
Induction without a base case
Jan 5, 2014
answer
16
How to solve $y = \sqrt{k\sqrt{k\sqrt{k \sqrt{k\sqrt{\dots}}}}}$?
Dec 30, 2013
answer
10
N! ends with exactly 30 zeros?
Jul 18, 2014
answer
9
If $f(x)$ is discontinuous at $x=0$, can $\int_{-1}^1 f(x)dx$ exist.
Jul 18, 2014
answer
9
Consider the trace map $M_n (\mathbb{R}) \to \mathbb{R}$. What is its kernel?
Feb 16, 2014
answer
8
If $a,b\in\mathbb R\setminus\{0\}$ and $a+b=4$, prove that $(a+\frac{1}{a})^2+(b+\frac{1}{b})^2\ge12.5$.
Dec 23, 2013
answer
8
How can I show that $\left|\sum_{n=1}^\infty\frac{x}{n^2+x^2}\right|\leq\frac{\pi}{2}$ for any $x\in{\bf R}$?
Dec 18, 2013
answer
7
How to determine the Taylor Series for a polynomial?
Feb 7, 2014
answer
6
Given a triangle find the length of BC
Jan 16, 2014
answer
6
Inequality using AM-GM
Jul 13, 2014
Top network posts
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11
Clang modifies return value in destructor?
8
C++ signed and unsigned int vs long long speed
7
Define function using variable list
7
Android Hexagon Grid
6
TikZ node label alignment

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