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Mathematics
J.R.'s user avatar
J.R.'s user avatar
J.R.'s user avatar
J.R.
  • Member for 13 years, 1 month
  • Last seen more than 3 years ago
  • Bonn, Germany
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View all questions and answers
answer
51
Is every composite number the average of two primes?
Mar 10, 2015
answer
48
"Simple" beautiful math proof
Mar 26, 2014
answer
33
A natural proof of the Cauchy-Schwarz inequality
Jul 5, 2013
answer
25
Evaluate $\sum^\infty_{n=1} \frac{1}{n^4} $using Parseval's theorem (Fourier series)
Jan 25, 2014
answer
24
Hatcher Problem 2.2.36
Feb 9, 2014
answer
23
What is the difference between totally bounded and uniformly bounded?
Oct 16, 2012
answer
21
Sum of four squares not a prime
Feb 18, 2014
answer
20
Convergence of the sequence $\frac{1}{n\sin(n)}$
Feb 6, 2014
answer
19
Proof of an equality involving cosine $\sqrt{2 + \sqrt{2 + \cdots + \sqrt{2 + \sqrt{2}}}}\ =\ 2\cos (\pi/2^{n+1})$
Jan 24, 2014
answer
18
convexity of inverse function
Feb 26, 2014