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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 views

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 …
Eduardo Longa's user avatar
6 votes
0 answers
89 views

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 $M$. …
Eduardo Longa's user avatar
6 votes
1 answer
336 views

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}^ …
Eduardo Longa's user avatar
4 votes
0 answers
161 views

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? …
Eduardo Longa's user avatar
4 votes
0 answers
239 views

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 …
Eduardo Longa's user avatar
3 votes
1 answer
197 views

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 : …
Eduardo Longa's user avatar
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 …
Eduardo Longa's user avatar
3 votes
1 answer
157 views

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. …
Eduardo Longa's user avatar
2 votes
1 answer
187 views

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? …
Eduardo Longa's user avatar
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…) …
Eduardo Longa's user avatar
1 vote
0 answers
245 views

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 $ …
Eduardo Longa's user avatar