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Consider a smooth $4$-manifold $X$ and a diffeomorphism $f : X \to X$. We give an obstruction in the form of an adjunction inequality for an embedded surface in $X$ to be isotopic to its image under $f$. It follows that the minimal genus of…

Differential Geometry · Mathematics 2024-11-14 David Baraglia

We study the minimal genus problem for some smooth four-manifolds.

Geometric Topology · Mathematics 2023-07-11 András I. Stipsicz , Zoltán Szabó

For several embedded surfaces with zero self-intersection number in 4-manifolds, we show that an adjunction-type genus bound holds for at least one of the surfaces under certain conditions. For example, we derive certain adjunction…

Geometric Topology · Mathematics 2017-04-14 Hokuto Konno

Let N be a closed irreducible 3-manifold and assume N is not a graph manifold. We improve for all but finitely many S^1-bundles M over N the adjunction inequality for the minimal complexity of embedded surfaces. This allows us to completely…

Geometric Topology · Mathematics 2018-12-24 Stefan Friedl , Stefano Vidussi

In this paper, the symplectic genus for any 2-dimensional class in a 4-manifold admitting a symplectic structure is introduced, and its relation with the minimal genus is studied. It is used to describe which classes in rational and…

Geometric Topology · Mathematics 2007-05-23 Bang-He Li , Tian-Jun Li

For any positive integer $g$, we completely determine the minimal genus function for $\Sigma_{g}\times T^{2}$. We show that the lower bound given by the adjunction inequality is not sharp for some class in $H_{2}(\Sigma_{g}\times T^{2})$.…

Geometric Topology · Mathematics 2021-05-05 Reito Nakashima

We study exotic smoothings of open 4-manifolds using the minimal genus function and its analog for end homology. While traditional techniques in open 4-manifold smoothing theory give no control of minimal genera, we make progress by using…

Geometric Topology · Mathematics 2017-03-14 Robert E. Gompf

We investigate constraints on embeddings of a non-orientable surface in a $4$-manifold with the homology of $M \times I$, where $M$ is a rational homology $3$-sphere. The constraints take the form of inequalities involving the genus and…

Geometric Topology · Mathematics 2015-05-27 Ira M. Gessel , Adam Simon Levine , Daniel Ruberman , Saso Strle

In this paper we prove genus bounds for closed embedded minimal surfaces in a closed 3-dimensional manifold constructed via min-max arguments. A stronger estimate was announced by Pitts and Rubistein but to our knowledge its proof has never…

Analysis of PDEs · Mathematics 2009-05-26 Camillo De Lellis , Filippo Pellandini

We present a few general results on foliations of 4-manifolds by surfaces: existence, tautness, relations to minimal genus of embedded surfaces; as well as some open problems. We hope to stimulate interest in this area.

Geometric Topology · Mathematics 2007-05-23 Alexandru Scorpan

We study the problem of finding the minimal (maximal) genus for a surface where a given four-valent graph with fixed opposite edge structure can be embedded into. We find several partial relations and give new reformulations in…

Combinatorics · Mathematics 2008-04-29 Vassily Olegovich Manturov

A very interesting problem in the classical theory of minimal surfaces consists of the classification of such surfaces under some geometrical and topological constraints. In this short paper, we give a brief summary of the known…

Differential Geometry · Mathematics 2007-05-23 M. Magdalena Rodriguez

In this paper we consider models for genus one curves of degree n for n = 2, 3 and 4, which arise in explicit n-descent on elliptic curves. We prove theorems on the existence of minimal models with the same invariants as the minimal model…

Number Theory · Mathematics 2015-10-28 John Cremona , Tom Fisher , Michael Stoll

We prove an enumerative min-max theorem that relates the number of genus g minimal surfaces in 3-manifolds of positive Ricci curvature to topological properties of the set of embedded surfaces of genus $\leq g$, possibly with finitely many…

Differential Geometry · Mathematics 2026-01-06 Adrian Chun-Pong Chu , Yangyang Li , Zhihan Wang

We obtain new lower bounds of the minimal genus of a locally flat surface representing a 2-dimensional homology class in a topological 4-manifold with boundary, using the von Neumann-Cheeger-Gromov $\rho$-invariant. As an application our…

Geometric Topology · Mathematics 2007-05-23 Jae Choon Cha

We show the existence of a $4$-manifold with boundary that admits two non-diffeomorphic minimal genus relative trisections of the same $(g,k;p,b)$-type. To prove this, we introduce a simple operation that produces a trisection diagram of a…

Geometric Topology · Mathematics 2024-06-06 Natsuya Takahashi

We construct examples of non-isotrivial algebraic families of smooth complex projective curves over a curve of genus 2. This solves a problem from Kirby's list of problems in low-dimensional topology. Namely, we show that 2 is the smallest…

Algebraic Geometry · Mathematics 2014-11-11 Jim Bryan , Ron Donagi

There exists a properly embedded minimal surface of genus one with one end. The end is asymptotic to the end of the helicoid. This genus one helicoid is constructed as the limit of a continuous one-parameter family of screw-motion invariant…

Differential Geometry · Mathematics 2009-11-10 Matthias Weber , David Hoffman , Michael Wolf

Let X be a simply-connected closed oriented 4-manifold and A an embedded surface of genus g and negative self-intersection -N. We show that for fixed genus g there is an upper bound on N if the homology class of A is divisible or…

Geometric Topology · Mathematics 2019-03-05 M. J. D. Hamilton

We derive an obstruction to representing a homology class of a symplectic 4-manifold by an embedded, possibly disconnected, symplectic surface.

Geometric Topology · Mathematics 2019-03-05 M. J. D. Hamilton
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