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We prove an arithmetic removal result for all compact abelian groups, generalizing a finitary removal result of Kr\'al', Serra and the third author. To this end, we consider infinite measurable hypergraphs that are invariant under certain…

Combinatorics · Mathematics 2015-07-28 Pablo Candela , Balázs Szegedy , Lluís Vena

Green [Geometric and Functional Analysis 15 (2005), 340--376] established a version of the Szemer\'edi Regularity Lemma for abelian groups and derived the Removal Lemma for abelian groups as its corollary. We provide another proof of his…

Combinatorics · Mathematics 2008-05-01 Daniel Král' , Oriol Serra , Lluís Vena

We provide new examples of the asymptotic counting for the number of subsets on groups of given size which are free of certain configurations. These examples include sets without solutions to equations in non-abelian groups, and linear…

Combinatorics · Mathematics 2016-02-08 Juanjo Rué , Oriol Serra , Lluís Vena

In this paper we present an extension of the removal lemma to integer linear systems over abelian groups. We prove that, if the $k$--determinantal of an integer $(k\times m)$ matrix $A$ is coprime with the order $n$ of a group $G$ and the…

Combinatorics · Mathematics 2012-07-02 Daniel Král' , Oriol Serra , Lluís Vena

We obtain a removal lemma for systems of linear equations over the circle group, using a similar result for finite fields due to Kr\'al, Serra and Vena, and we discuss some applications.

Combinatorics · Mathematics 2011-09-15 Pablo Candela , Olof Sisask

We prove a removal lemma for systems of linear equations over finite fields: let $X_1,...,X_m$ be subsets of the finite field $\F_q$ and let $A$ be a $(k\times m)$ matrix with coefficients in $\F_q$ and rank $k$; if the linear system $Ax=b$…

Combinatorics · Mathematics 2008-09-11 Dan Král' , Oriol Serra , Lluís Vena

In this note we observe that in the hyper-graph removal lemma the edge removal can be done in a way that the symmetries of the original hyper-graph remain preserved. As an application we prove the following generalization of Szemer\'edi's…

Combinatorics · Mathematics 2008-09-17 Balazs Szegedy

Recent work of Gowers and Nagle, R\"odl, Schacht, and Skokan has established a hypergraph removal lemma, which in turn implies some results of Szemer\'edi and Furstenberg-Katznelson concerning one-dimensional and multi-dimensional…

Combinatorics · Mathematics 2007-05-23 Terence Tao

We show that the deletion theorem of a free arrangement is combinatorial, i.e., whether we can delete a hyperplane from a free arrangement keeping freeness depends only on the intersection lattice. In fact, we give an explicit sufficient…

Combinatorics · Mathematics 2017-09-26 Takuro Abe

Szemeredi's regularity lemma is an important tool in graph theory which has applications throughout combinatorics. In this paper we prove an analogue of Szemeredi's regularity lemma in the context of abelian groups and use it to derive some…

Combinatorics · Mathematics 2007-05-23 Ben Green

Given a fixed $k$-uniform hypergraph $F$, the $F$-removal lemma states that every hypergraph with few copies of $F$ can be made $F$-free by the removal of few edges. Unfortunately, for general $F$, the constants involved are given by…

Combinatorics · Mathematics 2025-06-04 Lior Gishboliner , Asaf Shapira

We formulate and prove a general result in spirit of hypergraph removal lemma for measurable functions of several variables.

Combinatorics · Mathematics 2013-09-17 Fedor Petrov

We prove an arithmetic regularity lemma for stable subsets of finite abelian groups, generalising our previous result for high-dimensional vector spaces over finite fields of prime order. A qualitative version of this generalisation was…

Logic · Mathematics 2018-05-18 C. Terry , J. Wolf

The graph removal lemma states that any graph on n vertices with o(n^{v(H)}) copies of a fixed graph H may be made H-free by removing o(n^2) edges. Despite its innocent appearance, this lemma and its extensions have several important…

Combinatorics · Mathematics 2012-11-16 David Conlon , Jacob Fox

Let $G$ be an abelian group of bounded exponent and $A \subseteq G$. We show that if the collection of translates of $A$ has VC dimension at most $d$, then for every $\epsilon>0$ there is a subgroup $H$ of $G$ of index at most…

Combinatorics · Mathematics 2019-04-12 Noga Alon , Jacob Fox , Yufei Zhao

We prove a removal lemma for induced ordered hypergraphs, simultaneously generalizing Alon--Ben-Eliezer--Fischer's removal lemma for ordered graphs and the induced hypergraph removal lemma. That is, we show that if an ordered hypergraph…

Combinatorics · Mathematics 2021-01-26 Henry Towsner

We give a new proof of quantifier elimination in the theory of all ordered abelian groups in a suitable language. More precisely, this is only "quantifier elimination relative to ordered sets" in the following sense. Each definable set in…

Logic · Mathematics 2012-01-24 Raf Cluckers , Immanuel Halupczok

Let H be a fixed graph with h vertices. The graph removal lemma states that every graph on n vertices with o(n^h) copies of H can be made H-free by removing o(n^2) edges. We give a new proof which avoids Szemer\'edi's regularity lemma and…

Combinatorics · Mathematics 2011-01-04 Jacob Fox

Modeling potential alloys requires the exploration of all possible configurations of atoms. Additionally, modeling the thermal properties of materials requires knowledge of the possible ways of displacing the atoms. One solution to finding…

Materials Science · Physics 2017-01-11 Wiley S. Morgan , Gus L. W. Hart , Rodney W. Forcade

Obtaining an efficient bound for the triangle removal lemma is one of the most outstanding open problems of extremal combinatorics. Perhaps the main bottleneck for achieving this goal is that triangle-free graphs can be highly unstructured.…

Combinatorics · Mathematics 2017-09-26 Lior Gishboliner , Asaf Shapira
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