Mathematics
H. H. Rugh's user avatar
H. H. Rugh's user avatar
H. H. Rugh's user avatar
H. H. Rugh
  • Member for 7 years, 4 months
  • Last seen more than a month ago
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About

Since 2011 I have been affiliated to the Math department at the University of Paris 11 (Orsay), France.

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View all questions and answers
All Questions Answers
Score Newest
answer
39
Is it possible to elementarily parametrize a circle without using trigonometric functions?
Oct 7, 2016
answer
29
Convergence of $\sum_n \frac{|\sin(n^2)|}{n}$
Aug 23, 2016
answer
21
Find the sum of an alternating, non-geometric series
Aug 26, 2016
answer
17
What are the properties of eigenvalues of permutation matrices?
Oct 16, 2016
answer
14
How do I solve this equation; $x^4+4x-1=0$?
Sep 6, 2016
answer
14
Prove that the system $A^T A x = A^T b$ always has a solution
Oct 27, 2016
answer
14
Let $a_1=\sqrt{6},a_{n+1}=\sqrt{6+a_n}$. Find $\lim\limits_{n \to \infty} (a_n-3)6^n$.
Apr 16, 2021
answer
13
Orthonormal basis of $\{(x_1, \dots, x_n) \mid x_1+x_2+\cdots+x_n=0\}$
Aug 1, 2016
answer
13
Closure of a set in the weak topology
Jul 26, 2016
answer
13
Space of compactly supported function is NOT complete
Aug 1, 2016
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11
Conditional convergence of $\sum_{n\geq 1} \frac{\sin(p(n))}{n}$?
7
Extensions of local vector fields to whole manifold

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