Results 11 to 20 of about 2,022,602 (228)

Two Simple and Reliable Metrics of Molecular Planarity: Molecular Planarity Parameter (MPP) and Span of Deviation from Plane (SDP) [PDF]

open access: yes, 2021
Planarity is a very important structural character of molecules, which is closely related to many molecular properties. However, there is currently no simple, universal, and robust way to measure molecular planarity. In order to fill this evident gap, we
Tian, Lu
core   +1 more source

Multilevel Planarity [PDF]

open access: yes, 2021
In this paper, we introduce and study multilevel planarity, a generalization of upward planarity and level planarity. Let $G = (V, E)$ be a directed graph and let $\ell: V \to \mathcal P(\mathbb Z)$ be a function that assigns a finite set of integers to ...
Barth, Lukas   +3 more
core   +1 more source

Synchronized Planarity with Applications to Constrained Planarity Problems [PDF]

open access: yes, 2021
We introduce the problem Synchronized Planarity. Roughly speaking, its input is a loop-free multi-graph together with synchronization constraints that, e.g., match pairs of vertices of equal degree by providing a bijection between their edges ...
Fink, Simon D.   +2 more
core   +1 more source

Beyond-Planarity: Turán-Type Results for Non-Planar Bipartite Graphs [PDF]

open access: yes, 2018
Beyond-planarity focuses on the study of geometric and topological graphs that are in some sense nearly planar. Here, planarity is relaxed by allowing edge crossings, but only with respect to some local forbidden crossing configurations.
Pfister, Maximilian   +4 more
core   +1 more source

Synchronized Planarity with Applications to Constrained Planarity Problems [PDF]

open access: yes, 2020
We introduce the problem Synchronized Planarity. Roughly speaking, its input is a loop-free multi-graph together with synchronization constraints that, e.g., match pairs of vertices of equal degree by providing a bijection between their edges ...
Fink, Simon D.   +2 more
core   +1 more source

Notes on Maskit's planarity theorem [PDF]

open access: yes, 2022
We give an account of the Planarity Theorem of Maskit. This gives a classification of finitely generated groups acting effectively properly discontinuously by orientation-preserving homeomorphisms on a planar surface.
Bowditch, B. H., Brian Bowditch
core   +1 more source

Simultaneous FPQ-ordering and hybrid planarity testing

open access: yes, 2021
We introduce and study a constrained planarity testing problem, called 1-FIXED CONSTRAINED PLANARITY, and prove that this problem can be solved in quadratic time for biconnected graphs.
Rutter I., Liotta G., Tappini A.
core   +1 more source

Min-$k$-planar Drawings of Graphs

open access: yesJournal of Graph Algorithms and Applications
The study of nonplanar drawings of graphs with restricted crossing configurations is a well-established topic in graph drawing, often referred to as beyond-planar graph drawing.
Carla Binucci   +9 more
doaj   +1 more source

Doping bi-layer graphene – trends in the periodic table [PDF]

open access: yesMaterials Advances
Selective doping of bi-layer graphene, a material made of two graphene layers, enables the generation of novel interconnected 2D graphene structures.
Sabrina Smid   +3 more
doaj   +1 more source

Crossing Numbers of Beyond Planar Graphs Re-revisited: A Framework Approach [PDF]

open access: yes
Beyond planarity concepts (prominent examples include k-planarity or fan-planarity) apply certain restrictions on the allowed patterns of crossings in drawings.
Völlering, Jan-Jakob   +5 more
core   +3 more sources

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