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Let $mathcal{G}$ be a $k$-uniform hypergraph, $mathcal{L}_{mathcal{G}}$ be its Laplacian tensor. And $beta( mathcal{G})$ denotes the maximum number of linearly independent nonnegative eigenvectors of $mathcal{L}_{mathcal{G}}$ corresponding to the eigenvalue $0$. In this paper, $beta( mathcal{G})$ is called the geometry connectivity of $mathcal{G}$. We show that the number of connected components of $mathcal{G}$ equals the geometry connectivity $beta( mathcal{G})$.
Frankl and Furedi (1989) conjectured that the $r$-graph with $m$ edges formed by taking the first $m$ sets in the colex ordering of ${mathbb N}^{(r)}$ has the largest graph-Lagrangian of all $r$-graphs with $m$ edges. In this paper, we establish some
Since Cho and Kim (2005) showed that the competition graph of a doubly partial order is an interval graph, it has been actively studied whether or not the same phenomenon occurs for other variants of competition graph and interesting results have bee
A 2-coloring of a hypergraph is a mapping from its vertices to a set of two colors such that no edge is monochromatic. Let $H_k(n,m)$ be a random $k$-uniform hypergraph on $n$ vertices formed by picking $m$ edges uniformly, independently and with rep
As a generalization of vertex connectivity, for connected graphs $G$ and $T$, the $T$-structure connectivity $kappa(G, T)$ (resp. $T$-substructure connectivity $kappa^{s}(G, T)$) of $G$ is the minimum cardinality of a set of subgraphs $F$ of $G$ that
An oriented hypergraph is an oriented incidence structure that extends the concepts of signed graphs, balanced hypergraphs, and balanced matrices. We introduce hypergraphic structures and techniques that generalize the circuit classification of the s