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Mathematics
Geoffrey Sangston's user avatar
Geoffrey Sangston's user avatar
Geoffrey Sangston's user avatar
Geoffrey Sangston
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question
15
Is a function $\mathbb{R}^n \to \mathbb{R}$ which has a closed and connected graph necessarily continuous?
Sep 29, 2023
question
10
Can a hyperbolic disk isometrically embed into $\mathbb{R}^3$, with a circle for its boundary?
May 15, 2021
question
9
If all circles have constant geodesic curvature, does the surface have constant curvature?
Jun 19, 2021
question
6
Is $x \mapsto d(x, A)$ a quotient map?
Apr 30, 2019
question
6
$f(z)$ is holomorphic on $|z| < 1$, with $|f(z)| ≤ 3$ and $f(\frac{1}{2}) = 2$. Show that $f(z) \neq 0$ when $|z| < \frac{1}{8}.$
Aug 6, 2021
question
5
Lawvere's Sets For Mathematics Exercise 2.29c
May 10, 2017
answer
5
If all circles have constant geodesic curvature, does the surface have constant curvature?
Jun 19, 2021
answer
4
Is every triangle a difference of two squares?
May 8
question
4
Natural conditions implying the union of closed sets is closed
May 25, 2017
answer
4
Is the Cauchy-Goursat theorem or even the homotopic invariance theorem valid for fields other than $\Bbb C$ which are similar to $\Bbb R^2$?
Dec 5, 2023