ﻻ يوجد ملخص باللغة العربية
A $k$-uniform tight cycle is a $k$-uniform hypergraph with a cyclic ordering of its vertices such that its edges are all the sets of size $k$ formed by $k$ consecutive vertices in the ordering. We prove that every red-blue edge-coloured $K_n^{(4)}$ contains a red and a blue tight cycle that are vertex-disjoint and together cover $n-o(n)$ vertices. Moreover, we prove that every red-blue edge-coloured $K_n^{(5)}$ contains four monochromatic tight cycles that are vertex-disjoint and together cover $n-o(n)$ vertices.
In 1999, Katona and Kierstead conjectured that if a $k$-uniform hypergraph $cal H$ on $n$ vertices has minimum co-degree $lfloor frac{n-k+3}{2}rfloor$, i.e., each set of $k-1$ vertices is contained in at least $lfloor frac{n-k+3}{2}rfloor$ edges, the
We show that for every {eta} > 0 there exists an integer n_0 such that every 2-colouring of the 3-uniform complete hypergraph on n geq n_0 vertices contains two disjoint monochromatic tight cycles of distinct colours that together cover all but at mo
An old conjecture of Zs. Tuza says that for any graph $G$, the ratio of the minimum size, $tau_3(G)$, of a set of edges meeting all triangles to the maximum size, $ u_3(G)$, of an edge-disjoint triangle packing is at most 2. Here, disproving a conjec
The Lagrangian of a hypergraph has been a useful tool in hypergraph extremal problems. In most applications, we need an upper bound for the Lagrangian of a hypergraph. Frankl and Furedi in cite{FF} conjectured that the $r$-graph with $m$ edges formed
In an $r$-uniform hypergraph on $n$ vertices a tight Hamilton cycle consists of $n$ edges such that there exists a cyclic ordering of the vertices where the edges correspond to consecutive segments of $r$ vertices. We provide a first deterministic po