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In this paper, we prove a sharp convergence theorem for the mean curvature flow of arbitrary codimension in spheres which improves Baker's convergence theorem. In particular, we obtain a new differentiable sphere theorem for submanifolds in…

Differential Geometry · Mathematics 2021-03-16 Dong Pu

We propose a new formulation of a vanishing theorem for surfaces. Although this vanishing theorem follows easily from the well-known Kawamata--Viehweg vanishing theorem, it turns out to be remarkably useful. In particular, it is sufficient…

Algebraic Geometry · Mathematics 2025-12-02 Osamu Fujino , Nao Moriyama

We give a direct and elementary proof of the theorem on formal functions by studying the behaviour of the Godement resolution of a sheaf of modules under completion.

Algebraic Geometry · Mathematics 2007-11-29 Fernado Sancho , Pedro Sancho

We prove that if the initial hypersurface of the mean curvature flow in spheres satisfies a sharp pinching condition, then the solution of the flow converges to a round point or a totally geodesic sphere. Our result improves the famous…

Differential Geometry · Mathematics 2015-06-16 Li Lei , Hongwei Xu

In this paper we study the deformation and Q-Gorenstein deformation theory of schemes with non-isolated singularities. We obtain obstruction spaces for the existence of deformations and also for local deformations to exist globally. Finally…

Algebraic Geometry · Mathematics 2009-08-24 Nikolaos Tziolas

In this paper, we present a new smoothing approach to solve general nonlinear complementarity problems. Under the $P_0$ condition on the original problems, we prove some existence and convergence results . We also present an error estimate…

Optimization and Control · Mathematics 2010-06-11 Mounir Haddou , Patrick Maheux

We recover Reidemeister's theorem using smooth functions and transversality.

Geometric Topology · Mathematics 2024-06-27 Hoel Queffelec

Doob's theorem provides guarantees of consistent estimation and posterior consistency under very general conditions. Despite the limitation that it only guarantees consistency on a set with prior probability 1, for many models arising in…

Statistics Theory · Mathematics 2018-01-11 Jeffrey W. Miller

Relations between some kinds of formal and standard smoothness, for morphisms of schemes, are clarified in surprisingly simple and direct ways, bypassing much of the customarily employed machinery. Even the deep local-to-global property of…

Algebraic Geometry · Mathematics 2016-11-07 Peter M Johnson

This paper discussed the existence and uniqueness of the smoothing solution of the Navier-Stokes equations. At first, we construct the theory of the linear equations which is about the unknown four variables functions with constant…

Analysis of PDEs · Mathematics 2011-06-23 Jianfeng Wang

This paper discussed the global existence of the smoothing solution for the Navier-Stokes equations. At first, we construct the theory of the linear equations which is about the unknown four variables functions with constant coefficients.…

Analysis of PDEs · Mathematics 2011-07-05 Jianfeng Wang

We prove a smooth compactness theorem for the space of embedded self-shrinkers in $\RR^3$. Since self-shrinkers model singularities in mean curvature flow, this theorem can be thought of as a compactness result for the space of all…

Differential Geometry · Mathematics 2009-07-16 Tobias H. Colding , William P. Minicozzi

In this note, we give a proof of the famous theorem of M. Morse dealing with the cancellation of a pair of non-degenerate critical points of a smooth function. Our proof consists of a reduction to the one-dimensional case where the question…

Geometric Topology · Mathematics 2013-07-10 Francois Laudenbach

We provide the main results of a deformation theory of smooth formal schemes. First we deal with the case of global lifting of smooth morphisms. We prove that the obstruction to the existence of a global lifting lies in a Ext^1 group. Then…

Algebraic Geometry · Mathematics 2008-01-21 Marta Perez

We extend the classical fundamental theorem of the local theory of smooth curves to a wider class of non-smooth data. Curvature and torsion are prescribed in terms of the distributional derivative measures of two given functions of bounded…

Differential Geometry · Mathematics 2025-06-17 Domenico Mucci , Alberto Saracco

We say that the set of $y$-smooth numbers $\mathcal{S}(N,y)$ up to $N$ is super smooth if $y=\log^KN$ for a large fixed constant $K$. We show that the Roth's theorem on arithmetic progressions is true in super smooth numbers case. This…

Number Theory · Mathematics 2025-10-22 Laurence P. Wijaya

We present a method giving a spinorial characterization of an immersion in a product of spaces of constant curvature. As a first application we obtain a proof using spinors of the fundamental theorem of immersion theory in that spaces. We…

Differential Geometry · Mathematics 2023-06-23 Alicia Basilio , Pierre Bayard , Marie-Amélie Lawn , Julien Roth

We obtain new mean value theorems for exponential sums with very smooth numbers, which provide a power saving against the trivial bound in region where previous bounds do not apply.

Number Theory · Mathematics 2025-06-30 F. Majeed , Igor E. Shparlinski

In this note we establish several versions of a compactness theorem for submanifolds. In particular we require only bounds on the second fundamental form and do not assume volume or diameter bounds. As an application we prove a compactness…

Differential Geometry · Mathematics 2011-04-26 Andrew A Cooper

Let $X$ be a smooth projective variety defined over a finite field. We show that any algebraic $1$-cycle on $X$ is rationally equivalent to a smooth $1$-cycle, which is a $\mathbb{Z}$-linear combination of smooth curves on $X$. We also…

Algebraic Geometry · Mathematics 2022-10-24 Xiaozong Wang