The paper characterizes stable cohomotopy groups in codimensions two and three, linking algebraic and geometric perspectives.
problem Characterizing stable cohomotopy groups in specific codimensions.
method Algebraic and geometric approaches, including CW complexes and bordism theory.
result Complete characterizations of stable cohomotopy in codimension two and partial results in codimension three.
Simple criteria for codimension two surface singularities.
problem Identifying singularities in surfaces of codimension two.
method Provided criteria for singularities in surfaces of codimension less than or equal to two.
result Conditions for codimension two singularities in ruled surfaces and center maps.
Generalizes halfspace theorems to higher dimensions for self-shrinkers.
problem Limitations of halfspace theorems in higher dimensions for self-shrinkers.
method Extends codimension 1 results to arbitrary codimension.
result Establishes new halfspace theorems for self-shrinkers in arbitrary codimension.
Minimal real Kähler submanifolds in codimension 6 are holomorphic.
problem Characterizing real Kähler submanifolds in high codimension.
method Using isometric rigidity and properties of the second fundamental form.
result Minimal real Kähler submanifolds in codimension 6 are holomorphic.
Totally geodesic submanifolds in hyperbolic space up to codimension two.
problem Characterizing minimal homogeneous submanifolds in hyperbolic spaces.
method Analyzing properties of minimal submanifolds in hyperbolic spaces up to codimension two.
result Minimal homogeneous submanifolds of hyperbolic space up to codimension two are totally geodesic.
Study wall singularities in spaces with upper curvature bounds.
problem Understanding singularities in spaces with curvature constraints.
method Geometric structure theorem and geometric characterization for codimension one and two.
result Necessary and sufficient conditions for singular sets to be of codimension at least two.
In this paper we consider the existence and regularity problem for Coulomb frames in the normal bundle of two-dimensional surfaces with higher codimension in Euclidean spaces. While the case of two codimensions can be approached directly by potential theory, more sophisticated methods have to be applied for codimension…
New examples of non-homeomorphic foliation leaves found.
problem Finding non-homeomorphic foliation leaves in manifolds.
method Examples of 5-manifolds and foliations of 6-manifolds.
result Examples of non-homeomorphic foliation leaves in C1 and C∞ foliations. Uniform waist inequalities proven for manifolds with Kazhdan groups in codimension two.
problem Proving uniform waist inequalities for manifolds with specific group properties.
method Using finite covers and Cheeger inequality for manifolds with Kazhdan fundamental groups.
result Finite covers of manifolds with Kazhdan groups satisfy uniform waist inequalities in codimension two.
Study shows codimension 2 foliations on simply-connected manifolds are smooth.
problem Existence of foliations by exotic tori on simply-connected manifolds.
method Analyzes singular Riemannian foliations on compact simply-connected manifolds.
result Foliations of codimension 2 on compact simply-connected manifolds are smooth.
Paper constructs a transfer map for codimension 2 submanifolds in higher index theory.
problem Higher index theory of codimension 2 submanifolds.
method Construction of codimension 2 transfer map and adjoint relationship with cyclic cohomology.
result Established adjoint relationship between codimension 2 transfer map and co-transfer map in cyclic cohomology.
The aim of the paper is to investigate the relation between inverse limit of branched manifolds and codimension zero laminations. We give necessary and sufficient conditions for such an inverse limit to be a lamination. We also show that codimension zero laminations are inverse limits of branched manifolds. The inverse…
We construct and embedding of a Nöbeling space Nn−2n of codimension 2 into a Menger space Mn−2n of codimension 2. This solves an open problem stated by R.~Engelking in 1978 in codimension~2.
Study how pairs of 1D foliations can be deformed into contact structures.
problem Understanding deformations of pairs of 1D foliations.
method Linear deformations of pairs of codimension one foliations into contact pairs.
result Main result provides applications and insights into foliation deformations.
We classify irreducible polar foliations of codimension q on quaternionic projective spaces HPn, for all (n,q)=(7,1). We prove that all irreducible polar foliations of any codimension (resp. of codimension one) on HPn are homogeneous if and only if n+1 is a prime number (resp. n is ev…
This paper classifies embedded, codimension-one spheres which are null homotopic. This information is used to show that all null homotopic, immersed codimension-one spheres which are taut in the sense of Terng and Thorbergsson are actually distance spheres.
In this article, we prove a Kahler extension theorem for real Kahler submanifolds of codimension 4 and rank at least 5. Our main theorem states that such a manifold is a holomorphic hypersurface in another real Kahler submanifold of codimension 2. This generalizes a result of Dajczer and Gromoll in 1997 which states th…
Study of codimension-1 embeddings in 3-manifolds using twist maps and push maps.
problem Embedding 3-manifolds in specific topological spaces.
method Sphere twist maps and push maps to construct codimension-1 spun embeddings.
result Every closed orientable 3-manifold admits a codimension-1 spun embedding in specific spaces.
Lu's conjecture proven for minimal surfaces in codimension two.
problem Proving Lu's conjecture for minimal surfaces in codimension two.
method Analyzing eigenvalues of Lu's fundamental matrix and squared norm of the second fundamental form.
result Lu's second-gap conjecture holds for minimal surfaces in codimension two.
This paper extends NCFI to odd codimension and computes examples.
problem Extending NCFI to foliations of odd codimension.
method Computing NCFI for various foliated manifolds in both even and odd codimensions.
result NCFI is an invariant of foliations in odd codimension, requiring an odd \(K_1\)-class.
Study shows singular set of certain graphs has codimension 1.
problem Understanding the singular set of specific graph structures.
method Proved using the area stationarity condition.
result Singular set has codimension 1.
Study high codimension mean curvature flow in Riemannian manifolds, proving limiting flow in Euclidean space.
problem Analyzing mean curvature flow in high codimension Riemannian manifolds.
method Establishing codimension estimate, using quadratic pinching condition, gradient estimates.
result Existence of limiting flow in Euclidean space under cylindrical pinching condition.
In this paper, we prove a classification theorem for self-shrinkers of the mean curvature flow with ∣A∣2≤1 in arbitrary codimension. In particular, this implies a gap theorem for self-shrinkers in arbitrary codimension.
Paper confirms conjecture for PL foliations of codimension 2.
problem Confirming Haefliger-Thurston's conjecture for PL foliations.
method Using a version of Mather-Thurston's theorem for PL homeomorphisms.
result Derive new homological properties for PL surface homeomorphisms.
Study extends knot width concept to higher dimensions, finding large widths possible.
problem Defining and measuring knot width in higher dimensions.
method Extended classical width definition to smooth codimension 2 knots in higher dimensions.
result Arbitrarily large widths of knots possible in each dimension.
In this paper we prove that a complete noncompact manifold with nonnegative Ricci curvature has a trivial codimension one homology unless it is a split or flat normal bundle over a compact totally geodesic submanifold. In particular, we prove the conjecture that a complete noncompact manifold with positive Ricci curvat…
New bounds on singularities for flow in higher dimensions.
problem Understanding singularities in higher-dimensional flows.
method Entropy and codimension bounds for generic singularities.
result Uniform entropy and dimension bounds for singularities.
Researchers found counterexamples to a 2-jet determination theorem in higher codimension.
problem Counterexample construction to the 2-jet determination Chern-Moser Theorem in higher codimension.
method Constructed counterexamples of quadratic submanifolds with specific properties.
result Generated counterexamples to the 2-jet determination Chern-Moser Theorem in higher codimension.
We study codimension one holomorphic distributions on the projective three-space, analyzing the properties of their singular schemes and tangent sheaves. In particular, we provide a classification of codimension one distributions of degree at most 2 with locally free tangent sheaves, and show that codimension one distr…
Sharp estimate for flow in any dimension.
problem Interior gradient estimate for graphical mean curvature flow.
method Proving sharp interior gradient estimate for area decreasing graphical mean curvature flow in arbitrary codimension.
result Generalized result in arbitrary codimension.
Algorithm decides if odd-dimensional maps can be immersed.
problem Deciding if maps can be immersed homotopic to a given map.
method Algorithm for odd codimension manifolds.
result Algorithm decides immersibility of maps in odd codimension.
Researchers prove an L-theoretic signature transfer in codimension 2.
problem Proving an L-theoretic signature invariance in codimension 2. method Constructing a transfer map between symmetric L-groups. result Signature transfer up to a torsion of order at most 4.
We derive curvature estimates for minimal submanifolds in Euclidean space for arbitrary dimension and codimension via Gauss map. Thus, Schoen-Simon-Yau's results and Ecker-Huisken's results are generalized to higher codimension. In this way we improve Hildebrandt-Jost-Widman's result for the Bernstein type theorem.
Generalizes holographic method to higher codimension submanifolds.
problem Extract higher-order local invariants of embeddings.
method Natural generalization of holographic method to higher codimension submanifolds.
result New invariants obstructing the order-by-order construction of unit defining maps.
The study classifies stable submanifolds in product spaces of projective spaces.
problem Classifying stable submanifolds in product spaces of projective spaces.
method Provided a classification theorem for compact stable minimal immersions in product spaces of projective spaces.
result Characterized complex minimal immersions in the product of two complex projective spaces.
Bounds on ancient mean curvature flows reduce system complexity.
problem Understanding the complexity of ancient mean curvature flows.
method Bounding codimension using entropy and Euclidean subspace.
result Sharp bounds on codimension for ancient flows.
We show that all finite-dimensional resolvable generalized manifolds with the piecewise disjoint arc-disk property are codimension one manifold factors. We then show how the piecewise disjoint arc-disk property and other general position properties that detect codimension one manifold factors are related. We also note …
We classify the hypersurfaces of Euclidean space that carry a totally geodesic foliation with complete leaves of codimension one. In particular, we show that rotation hypersurfaces with complete profiles of codimension one are characterized by their warped product structure. The local version of the problem is also con…
Discussing rigidity in codimension 2, extending rigidity concepts.
problem Local isometric rigidity problem in codimension 2.
method Extending rigidity concepts to include genuine and honest rigidity, studying isometric immersions in semi-Euclidean spaces.
result Necessity of natural singularity in inner product for transitivity.
Study on flat singularities of area-minimizing currents in codimension one.
problem Understanding flat singularities of area-minimizing currents in codimension one.
method Analyzing the structure of two-dimensional mod(q) area-minimizing currents near flat singularities.
result Currents are C1,α-perturbations of radially homogeneous special multiple-valued functions. Study shows Brakke flow's non-triviality for smooth boundaries in codimension 1.
problem Understanding Brakke flow's non-triviality for smooth boundaries in codimension 1.
method Analyzing spacetime Brakke flow constructed by Buet et al. for initial varifolds.
result Support of mass measure of spacetime Brakke flow coincides with classical mean curvature flow's support.
We study high codimension mean curvature flow of a submanifold Mn of dimension n in Euclidean space Rn+k subject to the quadratic curvature condition ∣A∣2≤cn∣H∣2,cn=min{3n4,n−21}. This condition extends the notion of two-convexity for hypersurface…
In this paper, we formulate the notion of the F-stability of self-shrinking solutions to mean curvature flow in arbitrary codimension. Then we give some classifications of the F-stable self-shrinkers in arbitrary codimension, in codimension one case, our results reduce to Colding-Minicozzi's res…
Shows uniqueness of cylindrical blowups in mean curvature flow.
problem Uniqueness of cylindrical blowups in mean curvature flow in higher codimension.
method Developed new methods to prove uniqueness of cylindrical blowups.
result Implication of regularity of the singular set for the system.
High codimension submanifolds evolve to convex shapes, leading to smooth limiting flows.
problem Evolution of high codimension submanifolds in Rn+k. method Proving asymptotic convexity and using it to show convergence to a smooth limiting flow.
result High codimension submanifolds evolve to convex shapes, and at singular times, rescaling converges to a smooth limiting flow.
2-stein submanifolds in space forms have constant curvature if normal connection is flat or codimension is 2.
problem Characterizing submanifolds with constant curvature in space forms.
method Analyzing submanifolds with flat normal connection or codimension 2.
result 2-stein submanifolds have constant curvature under specified conditions.
Establishes 4D regularity for certain metric spaces.
problem Noncollapsed sequences of metrics with Ricci tensor bounds.
method A priori L2 curvature estimates.
result Diffeomorphism finiteness and rigidity theorems.
We consider three generalizations of the isoperimetric problem to higher codimension and provide results on equilibrium, stability, and minimization.