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Related papers: Bistable Quad-Nets Composed of Four-Bar Linkages

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We study the stationary states of networks consisting of weakly coupled bistable units. We prove the existence of a high multiplicity of stable steady states in networks with very general inter-unit dynamics. We present a method for…

patt-sol · Physics 2008-02-03 R S MacKay , J A Sepulchre

We study rationality properties of quadric surface bundles over the projective plane. We exhibit families of smooth projective complex fourfolds of this type over connected bases, containing both rational and non-rational fibers.

Algebraic Geometry · Mathematics 2016-03-31 Brendan Hassett , Alena Pirutka , Yuri Tschinkel

A two-dimensional bistable lattice is a periodic triangular network of non-linear bi-stable rods. The energy of each rod is piecewise quadratic and has two minima. Consequently, a rod undergoes a reversible phase transition when its…

Mathematical Physics · Physics 2008-09-24 Andrej Cherkaev , Andrei Kouznetsov , Alexander Panchenko

A method is developed here for building differentiable three-dimensional manifolds on multicube structures. This method constructs a sequence of reference metrics that determine differentiable structures on the cubic regions that serve as…

Numerical Analysis · Mathematics 2022-04-13 Lee Lindblom , Oliver Rinne , Nicholas W. Taylor

We consider heteroclinic networks between $n \in \mathbb{N}$ nodes where the only connections are those linking each node to its two subsequent neighbouring ones. Using a construction method where all nodes are placed in a single…

Dynamical Systems · Mathematics 2023-09-07 Sofia B. S. D. Castro , Alexander Lohse

We study flexible polyhedral nets in isotropic geometry. This geometry has a degenerate metric, but there is a natural notion of flexibility. We study infinitesimal and finite flexibility, and classify all finitely flexible polyhedral nets…

Metric Geometry · Mathematics 2025-04-22 O. Pirahmad , H. Pottmann , M. Skopenkov

We study tilings of the plane composed of two repeating tiles of different assigned areas relative to an arbitrary periodic lattice. We classify isoperimetric configurations (i.e., configurations with minimal length of the interfaces) both…

Metric Geometry · Mathematics 2025-08-26 Francesco Nobili , Matteo Novaga , Emanuele Paolini

This note is a complete library of symbolic parametrized expressions for both real and complexified configuration spaces of a planar 4-bar linkage. Building upon the previous work from Izmestiev (2015), this library expands on the…

Metric Geometry · Mathematics 2024-12-06 Zeyuan He , Simon D. Guest

A `discrete differential manifold' we call a countable set together with an algebraic differential calculus on it. This structure has already been explored in previous work and provides us with a convenient framework for the formulation of…

High Energy Physics - Theory · Physics 2009-10-28 A. Dimakis , F. M"uller-Hoissen , F. Vanderseypen

Quadric complexes are square complexes satisfying a certain combinatorial nonpositive curvature condition. These complexes generalize 2-dimensional CAT(0) cube complexes and are a square analog of systolic complexes. We introduce and study…

Group Theory · Mathematics 2019-11-27 Nima Hoda

We study heteroclinic networks in $\mathbb{R}^4$, made of a certain type of simple robust heteroclinic cycle. In simple cycles all the connections are of saddle-sink type in two-dimensional fixed-point spaces. We show that there exist only…

Dynamical Systems · Mathematics 2016-10-21 Alexander Lohse , Sofia B. S. D. Castro

Metric networks are network-shaped, one-dimensional structures on which one can solve differential equations to simulate a wide range of physical systems including conjugated molecules, photonic crystals, quantum mechanics in waveguide…

Disordered Systems and Neural Networks · Physics 2026-02-27 Charles Emmett Maher , Jeremy L. Marzuola , Katherine A. Newhall

A constructive characterization of the class of uniformly $4$-connected graphs is presented. The characterization is based on the application of graph operations to appropriate vertex and edge sets in uniformly $4$-connected graphs, that…

Combinatorics · Mathematics 2025-07-11 Xiang Chen , Shuai Kou , Chengfu Qin , Liqiong Xu , Weihua Yang

We study set systems formed by neighborhoods in graphs of bounded twin-width. We start by proving that such graphs have linear neighborhood complexity, in analogy to previous results concerning graphs from classes with bounded expansion and…

Logic in Computer Science · Computer Science 2023-04-27 Wojciech Przybyszewski

We investigate finite right-distributive binary algebraic structures called shelves. We first use symbolic computations with Python to classify (up to isomorphism) all connected shelves with order less than six. We explore the group…

Geometric Topology · Mathematics 2023-07-24 Mohamed Elhamdadi , Neranga Fernando , Mathew Goonewardena

We provide a geometric approach to two combinatorically symmmetric overconstrained spatial linkages. Both contain eight bodies and twelve revolute joints and collapse in aligned poses. The first one is spherical and the union of six…

Metric Geometry · Mathematics 2026-02-23 Hellmuth Stachel

Supercyclides are surfaces with a characteristic conjugate parametrization consisting of two families of conics. Patches of supercyclides can be adapted to a Q-net (a discrete quadrilateral net with planar faces) such that neighboring…

Differential Geometry · Mathematics 2017-09-08 Alexander I. Bobenko , Emanuel Huhnen-Venedey , Thilo Rörig

Band engineering in twisted bilayers of the five generic two-dimensional Bravais networks is demonstrated. We first derive symmetry-based constraints on the interlayer coupling, which helps us to predict and understand the shape of the…

Strongly Correlated Electrons · Physics 2019-11-13 Toshikaze Kariyado , Ashvin Vishwanath

Bridge multisections are combinatorial descriptions of surface links in 4-space using tuples of trivial tangles. They were introduced by Islambouli, Karimi, Lambert-Cole, and Meier to study curves in rational surfaces. In this paper, we…

Geometric Topology · Mathematics 2026-04-13 Román Aranda , Carolyn Engelhardt

We introduce four basic two-dimensional (2D) plaquette configurations with onsite cubic nonlinearities, which may be used as building blocks for 2D PT -symmetric lattices. For each configuration, we develop a dynamical model and examine its…

Quantum Physics · Physics 2012-10-24 Kai Li , P. G. Kevrekidis , Boris A. Malomed , Uwe Guenther