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We study certain equivariant deformation components of minimally elliptic surface singularities under finite group actions. Interesting examples include cyclic quotients of simple elliptic singularities and finite group quotients of cusp…

Algebraic Geometry · Mathematics 2025-11-04 Sagnik Das , Yunfeng Jiang

We study singularities of surfaces which are given by Kenmotsu-type formula with prescribed unbounded mean curvature.

Differential Geometry · Mathematics 2019-04-10 Luciana F. Martins , Kentaro Saji , Keisuke Teramoto

The stability and the index of complete one-sided minimal surfaces of certain three-dimensional Riemannian manifolds with positive scalar curvature are studied.

Differential Geometry · Mathematics 2011-06-14 Francisco Urbano

In this paper, homology of a contact CR-submanifold of a real hypersurface, which has naturally almost contact metric structure induced from the complex Euclidean space $\mathbb{C}^{m}$, is examined. More precisely, nonexistence of stable…

Differential Geometry · Mathematics 2021-07-28 Fulya Sahin , Bayram Sahin

In this paper, we first classify singular fibers of proper $C^\infty$ stable maps of 3-dimensional manifolds with boundary into surfaces. Then, we compute the cohomology groups of the associated universal complex of singular fibers, and…

Geometric Topology · Mathematics 2016-07-20 Osamu Saeki , Takahiro Yamamoto

In this work we prove the existence of embedded closed minimal hypersurfaces in non-compact manifolds containing a bounded open subset with smooth and strictly mean-concave boundary and a natural behavior on the geometry at infinity. For…

Differential Geometry · Mathematics 2014-05-16 Rafael Montezuma

In this expository paper, we discuss some of the main geometric inequalities for minimal hypersurfaces. These include the classical monotonicity formula, the Alexander-Osserman conjecture, the isoperimetric inequality for minimal surfaces,…

Differential Geometry · Mathematics 2023-03-14 S. Brendle

We investigate the minimal singularities of metrics on a big line bundle $L$ over a projective manifold when the stable base locus $Y$ of $L$ is a submanifold of codimension $r\geq 1$. Under some assumptions on the normal bundle and a…

Complex Variables · Mathematics 2018-11-20 Genki Hosono , Takayuki Koike

We prove a "strong" Durfee-type inequality for isolated hypersurface surface singularities, which implies Durfee's strong conjecture for such singularities with non-negative topological Euler number of the exceptional set of the minimal…

Algebraic Geometry · Mathematics 2018-05-15 Makoto Enokizono

We examine some common features of minimal surfaces, nonzero constant mean curvature surfaces and marginally outer trapped surfaces, concerning their stability and rigidity, and consider some applications to Riemannian geometry and general…

Differential Geometry · Mathematics 2011-01-31 Gregory J. Galloway

We study the topology of singularities of $c$-optimal semicouplings in unequal dimension. Our main results describe homotopy-reductions from a source space $(X,\sigma)$ onto the singularities $Z_j$, $j\geq 0$ of $c$-optimal semicouplings…

Geometric Topology · Mathematics 2022-02-01 J. H. Martel

We prove there exists a compact embedded minimal surface in a complete finite volume hyperbolic $3$-manifold $\mathcal{N}$. We also obtain a least area, incompressible, properly embedded, finite topology, $2$-sided surface. We prove a…

Differential Geometry · Mathematics 2014-06-26 Pascal Collin , Laurent Hauswirth , Laurent Mazet , Harold Rosenberg

Let M be a smooth connected compact surface, P be either the real line R^1 or the circle S^1, and f:M-->P be a smooth mapping. In a previous series of papers for the case when f is a Morse map the author calculated the homotopy types of…

Geometric Topology · Mathematics 2009-12-17 Sergiy Maksymenko

We show that isolated surface singularities which are non-normal may have Milnor fibers which are non-diffeomorphic to those of their normalizations. Therefore, non-normal isolated singularities enrich the collection of Stein fillings of…

Algebraic Geometry · Mathematics 2015-03-06 Patrick Popescu-Pampu

We study singularities and Artin's contraction theorem for orbifold surfaces. Our main result has a consequence which is in the direction of the birational Minimal Model Program for b-terminal orbifold surfaces. For example, we ascertain…

Algebraic Geometry · Mathematics 2021-10-12 Nathan Grieve

We consider smooth flows preserving a smooth invariant measure, or, equivalently, locally Hamiltonian flows on compact orientable surfaces and show that almost every such locally Hamiltonian flow with only simple saddles has singular…

Dynamical Systems · Mathematics 2025-05-20 Krzysztof Frączek , Adam Kanigowski , Corinna Ulcigrai

We study relative hypersurfaces over curves, and prove an instability condition for the fibres. This gives an upper bound on the log canonical threshold of the relative hypersurface. We compare these results with the information that can be…

Algebraic Geometry · Mathematics 2023-12-29 M. A. Barja , L. Stoppino

We establish birational superrigidity for a large class of singular projective Fano hypersurfaces of index one. In the special case of isolated singularities, our result applies for instance to: (1) hypersurfaces with semi-homogeneous…

Algebraic Geometry · Mathematics 2016-04-07 Tommaso de Fernex

We give an overview of the fundamental definitions and results concerning hypersurface singularities, defined by convergent power series over an arbitrary real valued field. This approach combines, on the one hand, the classical case of…

Algebraic Geometry · Mathematics 2026-02-18 Gert-Martin Greuel

We study normal forms of germs of singular real-analytic Levi-flat hypersurfaces. We prove the existence of rigid normal forms for singular Levi-flat hypersurfaces which are defined by the vanishing of the real part of complex…

Complex Variables · Mathematics 2018-10-16 Arturo Fernández-Pérez , Gustavo Marra
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