Zobrazeno 1 - 10
of 375
pro vyhledávání: '"Füredi, Zoltán"'
There are four non-isomorphic configurations of triples that can form a triangle in a $3$-uniform hypergraph. Forbidding different combinations of these four configurations, fifteen extremal problems can be defined, several of which already appeared
Externí odkaz:
http://arxiv.org/abs/2405.16452
Autor:
Füredi, Zoltán, Kostochka, Alexandr
Let $ a,b \in {\bf Z}^+$, $r=a + b$, and let $T$ be a tree with parts $U = \{u_1,u_2,\dots,u_s\}$ and $V = \{v_1,v_2,\dots,v_t\}$. Let $U_1, \dots ,U_s$ and $V_1, \dots, V_t$ be disjoint sets, such that {$|U_i|=a$ and $|V_j|=b$ for all $i,j$}. The {\
Externí odkaz:
http://arxiv.org/abs/2307.04932
In this entry point into the subject, combining two elementary proofs, we decrease the gap between the upper and lower bounds by $0.2\%$ in a classical combinatorial number theory problem. We show that the maximum size of a Sidon set of $\{ 1, 2, \ld
Externí odkaz:
http://arxiv.org/abs/2103.15850
Autor:
Füredi, Zoltán, Zhao, Yi
We prove a minimum degree version of the Kruskal--Katona theorem: given $d\ge 1/4$ and a triple system $F$ on $n$ vertices with minimum degree at least $d\binom n2$, we obtain asymptotically tight lower bounds for the size of its shadow. Equivalently
Externí odkaz:
http://arxiv.org/abs/2103.13571
A {\em special four-cycle } $F$ in a triple system consists of four triples {\em inducing } a $C_4$. This means that $F$ has four special vertices $v_1,v_2,v_3,v_4$ and four triples in the form $w_iv_iv_{i+1}$ (indices are understood $\pmod 4$) where
Externí odkaz:
http://arxiv.org/abs/2103.09774
A convex geometric hypergraph or cgh consists of a family of subsets of a strictly convex set of points in the plane. There are eight pairwise nonisomorphic cgh's consisting of two disjoint triples. These were studied at length by Bra{\ss} (2004) and
Externí odkaz:
http://arxiv.org/abs/2010.11100
In this paper we present a novel approach in extremal set theory which may be viewed as an asymmetric version of Katona's permutation method. We use it to find more Tur\'an numbers of hypergraphs in the Erd\H{o}s--Ko--Rado range. An $(a,b)$-path $P$
Externí odkaz:
http://arxiv.org/abs/2003.00622
The notion of cross intersecting set pair system of size $m$, $\Big(\{A_i\}_{i=1}^m, \{B_i\}_{i=1}^m\Big)$ with $A_i\cap B_i=\emptyset$ and $A_i\cap B_j\ne\emptyset$, was introduced by Bollob\'as and it became an important tool of extremal combinator
Externí odkaz:
http://arxiv.org/abs/1911.03067
Autor:
Füredi, Zoltán, Gerbner, Dániel
Here we give a short, concise proof for the following result. There exists a $k$-uniform hypergraph $H$ (for $k\geq 5$) without exponent, i.e., when the Tur\'an function is not polynomial in $n$. More precisely, we have $ex(n,H)=o(n^{k-1})$ but it ex
Externí odkaz:
http://arxiv.org/abs/1906.06657
