Results 241 to 250 of about 1,336,081 (334)

Conformal Hypergraphs: Duality and Implications for the Upper Clique Transversal Problem

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT Given a hypergraph H ${\rm{ {\mathcal H} }}$, the dual hypergraph of H ${\rm{ {\mathcal H} }}$ is the hypergraph of all minimal transversals of H ${\rm{ {\mathcal H} }}$. The dual hypergraph is always Sperner, that is, no hyperedge contains another.
Endre Boros   +3 more
wiley   +1 more source

Weighted Turán Theorems With Applications to Ramsey‐Turán Type of Problems

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT We study extensions of Turán Theorem in edge‐weighted settings. A particular case of interest is when constraints on the weight of an edge come from the order of the largest clique containing it. These problems are motivated by Ramsey‐Turán type problems.
József Balogh   +2 more
wiley   +1 more source

Plane Algebraic Curves [PDF]

open access: green, 1921
G. B. Mathews, Harold Hilton
openalex   +1 more source

On Bipartite Biregular Large Graphs Derived From Difference Sets

open access: yesJournal of Graph Theory, EarlyView.
ABSTRACT A bipartite graph G = ( V , E ) $G=(V,E)$ with V = V 1 ∪ V 2 $V={V}_{1}\cup {V}_{2}$ is biregular if all the vertices of each stable set, V 1 ${V}_{1}$ and V 2 ${V}_{2}$, have the same degree, r $r$ and s $s$, respectively. This paper studies difference sets derived from both Abelian and non‐Abelian groups.
Gabriela Araujo‐Pardo   +3 more
wiley   +1 more source

The Fermionic Massless Modular Hamiltonian. [PDF]

open access: yesCommun Math Phys
La Piana F, Morsella G.
europepmc   +1 more source

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