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A surface is a two-dimensional topological manifold. The term can also be used to describe a smooth surface, depending on the context.
7
votes
2
answers
362
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Constant Gaussian curvature disks
This question has also been posted on MSE, but maybe here is the right place to post it.
Is it true that if $D$ is a Riemannian $2$-disk having constant Gaussian curvature equal to $1$ and whose bound …
6
votes
0
answers
89
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Convergence of free boundary minimal surfaces
Let $\{\Sigma_n\}_{n \geq 1}$ be a sequence of compact and orientable free boundary minimal surfaces embedded in $M$. …
6
votes
1
answer
336
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Is Gauss map of a free boundary convex disk a diffeomorphism?
I asked this question on MSE, but obtained no answer. Maybe this is the right place to post it.
Let $D$ be a properly embedded free boundary disk in the closed unit ball $\mathbb{B}^3$ of $\mathbb{R}^ …
4
votes
0
answers
161
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Upper bound for the first eigenvalue of the Laplacian on surfaces with boundary
If this is not the case, what are the topological types of surfaces for which this supremum is finite? …
4
votes
0
answers
239
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Infinitely many simple closed geodesics in any compact orientable surface but the sphere
My question is the following: if $(\Sigma, g)$ is any compact orientable Riemannian surface of genus $g \geq 1$, is it true that there are infinitely many closed, simple and geometrically distinct geo …
3
votes
1
answer
197
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Area of a deformation of a closed surface
Let $(M^3,g)$ be a complete Riemannian manifold. Fix a two-sided immersion $\varphi : \Sigma^2 \to M$ from a closed surface into $M$, with unit normal $N$. Given $f \in C^\infty(\Sigma)$ and $\alpha : …
3
votes
0
answers
73
views
Leaves of bounded genus
Let $\mathcal{F}$ be a codimension one foliation in a closed $3$-manifold $M$. Does there exist an upper bound for the genus of the compact orientable leaves? That is, does there exist $G >0$ such tha …
3
votes
1
answer
157
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Finitely connected orientable surface
This is part of an argument in the paper “ On complete minimal surfaces with finite Morse index in three manifolds”, by Fischer-Colbrie. …
2
votes
1
answer
187
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Space of embedded minimal surfaces of fixed genus in a generic $3$-manifold
Is it true that for a generic set of Riemannian metrics on $M$ the set of closed, connected and orientable embedded minimal surfaces of genus $g$ in $M$ is compact? …
2
votes
0
answers
120
views
Every surface of sufficiently large genus separates
Then, attaching small handles to $\Sigma$ would produce nonseparating surfaces of every genus $\geq g$.
(sorry if it is a silly question…) …
1
vote
0
answers
245
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Why does this PDE have a solution?
Let $\Sigma$ be a compact surface and denote by $\nu$ the unit conormal for $\partial \Sigma$. Let
$$E = \left\{ \phi \in C^{2,\alpha}(\Sigma) : \int_{\Sigma} \phi \, \mathrm{d}A = 0 \right\} $$
and
$ …