Mathematics
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Hedgehog
  • Member for 7 years, 8 months
  • Last seen more than a month ago
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80
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Top posts
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All Questions Answers
Score Newest
question
6
Proof that $\sum\limits_{i=1}^n \cos \sqrt{i}$ is unbounded.
Oct 20, 2014
question
6
Does there exist a function that is continuous at every rational point and discontinuous at every irrational point? And vice versa?
Oct 27, 2014
question
6
Infinite removal of isolated points from a subset of $\mathbb{R}$.
Oct 28, 2014
question
6
What is the minimum number of edges in this special graph?
Dec 16, 2016
question
6
Volume of $E=\{5x^8 \le y \le 7x^8; 2y^5 \le z \le 3y^5; z^7 \le x \le 6z^7\}$.
May 15, 2017
answer
6
If $f(x^2)-f(x)^2\geq \frac14$ for every $x$ then $f$ is not injective
Oct 29, 2017
question
5
Is $\mathbb{R}\setminus\mathbb{Q}$ a union of countable family of closed sets?
Oct 28, 2014
question
5
Solving PDE with Laplace transform
Dec 15, 2017
question
4
2-manifold with involution without fixed points is a boundary of a 3-manifold.
Dec 7, 2017
question
4
Proof that the cardinality of continuous functions on $\mathbb{R}$ is equal to the cardinality of $\mathbb{R}$.
Oct 26, 2014
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11
Connected compact manifolds with unique Lie group structure

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