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Mathematics
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cnikbesku
  • Member for 9 years, 5 months
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question
16
If $f:\mathbb{R}^2\rightarrow\mathbb{R}$ is a polynomial on every line, is it a polynomial itself? [duplicate]
Jan 21, 2023
question
10
Can $\mathbb{S}^2$ wind around $\mathbb{S}^2$ twice, just like you would wind $\mathbb{S}^1$ around $\mathbb{S}^1$ $n$ times
Dec 8, 2022
question
10
A non-zero function on $\mathbb{R}^n$ whose integral over any ball of radius $1$ is zero?
Jan 13, 2023
question
6
Does such a weird convergent sequence exist?
Sep 1
question
6
Why $P(z)\text{sin}(z)+Q(z)\text{cos}(z)$ has only finitely many non-real zeroes?
Feb 25, 2021
question
6
Are bilinear functionals continuous, in general?
Jan 12
question
5
If "averaged" derivative is zero, the function is constant?
Jul 23
question
5
Is this relation making a space Hausdorff?
Jul 20
answer
5
prove $\lim_{n\to\infty}n!\sum_{k=n+1}^\infty\frac{1}{k!} = 0$
Jan 9, 2023
question
4
Area of convex hull of 6 points greater than twice the sum of the areas of 2 triangles formed by the 6 points
Dec 23, 2015