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This article is the continuation of the first named author work "On maximal totally real embeddings". For real analytic compact manifolds equipped with a covariant derivative operator acting on the real analytic sections of its tangent…

Complex Variables · Mathematics 2023-10-11 Nefton Pali , Bruno Salvy

We characterize the perimeter-minimizing double bubbles on all flat two-tori and, as corollaries, on the flat infinite cylinder and the flat infinite strip with free boundary. Specifically, we show that there are five distinct types of…

Metric Geometry · Mathematics 2009-09-29 Joseph Corneli , Paul Holt , George Lee , Nicholas Leger , Eric Schoenfeld , Benjamin Steinhurst

We study topological groups having all closed subgroups (totally) minimal and we call such groups c-(totally) minimal. We show that a locally compact c-minimal connected group is compact. Using a well-known theorem of Hall and Kulatilaka…

General Topology · Mathematics 2021-06-29 Wenfei Xi , Menachem Shlossberg

We characterize the number of points for which there exist non-empty Terracini sets of points in $\mathbb{P}^n$. Then we study minimally Terracini finite sets of points in $\mathbb{P}^n$ and we obtain a complete description in the case of…

Algebraic Geometry · Mathematics 2024-11-18 Edoardo Ballico , Maria Chiara Brambilla

The article proves the Infinitesimal Torelli theorem for surfaces subject to the following conditions: 1) the canonical bundle of a surface is ample and generated by its global sections, 2)the geometric genus $p_g \geq 4$, 3) the…

Algebraic Geometry · Mathematics 2018-03-06 Igor Reider

We prove that every complete, minimally immersed submanifold $f\: M^n \to \mathbb{S}^{n+p}$ whose second fundamental form satisfies $|A|^2 \le np/(2p-1)$, is either totally geodesic, or (a covering of) a Clifford torus or a Veronese surface…

Differential Geometry · Mathematics 2024-10-15 Marco Magliaro , Luciano Mari , Fernanda Roing , Andreas Savas-Halilaj

We show optimal FPT-approximability results for solving almost satisfiable systems of modular linear equations, completing the picture of the parameterized complexity and FPT-approximability landscape for the Min-$r$-Lin$(\mathbb{Z}_m)$…

Data Structures and Algorithms · Computer Science 2026-04-14 Konrad K. Dabrowski , Peter Jonsson , Sebastian Ordyniak , George Osipov , Magnus Wahlström

We prove a conjecture about the minimal nonnegative solutions of algebraic Riccati equations associated with reducible singular M-matrices. The result enhances our understanding of the behaviour of doubling algorithms for finding the…

Numerical Analysis · Mathematics 2015-03-26 Di Lu , Chun-Hua Guo

We study entire minimizers of the Allen-Cahn systems. The specific feature of our systems are potentials having a finite number of global minima, with sub-quadratic behaviour locally near their minima. The corresponding formal…

Analysis of PDEs · Mathematics 2021-10-05 Nicholas D. Alikakos , Dimitrios Gazoulis , Arghir Zarnescu

In this note we prove that any minimal $2$-torus in $S^4$ has Morse index at least $6$, with equality if and only if it is congruent to the Clifford torus in some great $S^3\subset S^4$.For a minimal $2$-torus in $S^n$ with vanishing Hopf…

Differential Geometry · Mathematics 2024-05-17 Rob Kusner , Peng Wang

We prove the infinitesimal Torelli theorem for general minimal complex surfaces X's with the first Chern number 3, the geometric genus 1, and the irregularity 0 which have non-trivial 3-torsion divisors. We also show that the coarse moduli…

Algebraic Geometry · Mathematics 2007-05-23 Masaaki Murakami

We give an effective infinitesimal Torelli theorem for cyclic covers of G/P, where G is a simple algebraic group and P is a maximal parabolic subgroup.

Algebraic Geometry · Mathematics 2013-01-24 Herbert Kanarek , Pedro L. Del Angel R

Let R be a commutative Noetherian ring. Licci ideals are the ideals of R that can be linked in a finite number of steps to a complete intersection. Each licci ideal admits a rigid deformation, and two licci ideals are in the same Herzog…

Commutative Algebra · Mathematics 2025-06-12 Lorenzo Guerrieri , Xianglong Ni , Jerzy Weyman

We establish a Mittag-Leffler-type theorem with approximation and interpolation for meromorphic curves $M\to \mathbb{C}^n$ ($n\geq 3$) directed by Oka cones in $\mathbb{C}^n$ on any open Riemann surface $M$. We derive a result of the same…

Differential Geometry · Mathematics 2025-10-09 Antonio Alarcon , Tjasa Vrhovnik

Let $A=\{{\bf a}_1,...,{\bf a}_m\} \subset \mathbb{Z}^n$ be a vector configuration and $I_A \subset K[x_1,...,x_m]$ its corresponding toric ideal. The paper consists of two parts. In the first part we completely determine the number of…

Commutative Algebra · Mathematics 2007-05-23 Hara Charalambous , Anargyros Katsabekis , Apostolos Thoma

Using discretized orthogonal systems (curvature line systems) with periodicity, created using Darboux transformations and their permutability, we have discrete and semi-discrete k-dimensional isothermic tori which are full in n-dimensional…

Differential Geometry · Mathematics 2026-03-27 K. Leschke , F. Pedit , W. Rossman

In this paper we study the extension of Morita equivalence of noncommutative tori to the supersymmetric case. The structure of the symmetry group yielding Morita equivalence appears to be intact but its parameter field becomes…

High Energy Physics - Theory · Physics 2011-01-07 Ee Chang-Young , Hoil Kim , Hiroaki Nakajima

We attempt a direct derivation of a conformal field theory description of 2D quantum gravity~+~matter from the formalism of integrable hierarchies subjected to Virasoro constraints. The construction is based on a generalization of the…

High Energy Physics - Theory · Physics 2010-12-01 A. M. Semikhatov

In this paper, we investigate the existence of KAM tori for an infinite dimensional Hamiltonian system with finite number of zero normal frequencies. By constructing a constant quantity we show that, for "most" frequencies in the sense of…

Dynamical Systems · Mathematics 2019-08-30 Yuan Wu , Xiaoping Yuan

We prove that the finite generation of adjoint rings proved in [Cascini and Lazi\'c] implies all the foundational results of the Minimal Model Program: the Rationality, Cone and Contraction theorems, the existence of flips, and termination…

Algebraic Geometry · Mathematics 2013-05-08 Alessio Corti , Vladimir Lazić
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