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This paper introduces the notion of an excellent quotient, which is stronger than a universal geometric quotient. The main result is that for an action of a connected solvable group $G$ on an affine scheme Spec$(R)$ there exists a…

Commutative Algebra · Mathematics 2017-12-12 Gregor Kemper

Hybrid systems, and especially piecewise affine (PWA) systems, are often used to model gene regulatory networks. In this paper we elaborate on previous work about control problems for this class of models, using also some recent results…

Dynamical Systems · Mathematics 2009-12-03 Etienne Farcot , Jean-Luc Gouzé

Correlation matrices are used in many domains of neurosciences such as fMRI, EEG, MEG. However, statistical analyses often rely on embeddings into a Euclidean space or into Symmetric Positive Definite matrices which do not provide intrinsic…

Differential Geometry · Mathematics 2021-03-09 Yann Thanwerdas , Xavier Pennec

The quotient operation, which is dual to the composition, is crucial in specification theories as it allows the synthesis of missing specifications and thus enables incremental design. In this paper, we consider a specification theory based…

Formal Languages and Automata Theory · Computer Science 2014-11-25 Guillaume Verdier , Jean-Baptiste Raclet

Substructural type systems, such as affine (and linear) type systems, are type systems which impose restrictions on copying (and discarding) of variables, and they have found many applications in computer science, including quantum…

Logic in Computer Science · Computer Science 2021-01-27 Vladimir Zamdzhiev

This work delves into the {\it quotient of an affine semigroup by a positive integer}, exploring its intricate properties and broader implications. We unveil an {\it associated tree} that serves as a valuable tool for further analysis.…

Commutative Algebra · Mathematics 2024-02-20 J. I. García-García , R. Tapia-Ramos , A. Vigneron-Tenorio

This paper deals with fractional-order controlled systems and fractional-order controllers in the discrete domain. The mathematical description by the fractional difference equations and properties of these systems are presented. A…

Optimization and Control · Mathematics 2007-05-23 I. Petras , L. Dorcak , I. Kostial

The affine coherent states quantization is a promising integral quantization of Hamiltonian systems when the phase space includes at least one conjugate pair of variables which takes values from a half-plane. Such a situation is common for…

Mathematical Physics · Physics 2020-12-15 Andrzej Góźdź , Włodzimierz Piechocki , Tim Schmitz

This paper presents a coordinate-free formulation of virtual holonomic constraints for underactuated Lagrangian control systems on Riemannian manifolds. It is shown that when a virtual constraint enjoys a regularity property, the…

Optimization and Control · Mathematics 2018-11-15 Luca Consolini , Alessandro Costalunga , Manfredi Maggiore

This paper considers control systems defined on Lie algebroids. After deriving basic controllability tests for general control systems, we specialize our discussion to the class of mechanical control systems on Lie algebroids. This class of…

Optimization and Control · Mathematics 2007-05-23 Jorge Cortes , Eduardo Martinez

In this paper we give a self-contained treatment of finite group quotients of admissible (formal) schemes and adic spaces that are locally topologically finite type over a locally strongly noetherian adic space.

Algebraic Geometry · Mathematics 2024-02-21 Bogdan Zavyalov

The purpose of this paper is to use the framework of Lie algebroids to study optimal control problems for affine connection control systems on Lie groups. In this context, the equations for critical trajectories of the problem are…

Optimization and Control · Mathematics 2014-06-16 L. Abrunheiro , M. Camarinha

In this paper we use an affine connection formulation to study an optimal control problem for a class of nonholonomic, under-actuated mechanical systems. In particular, we aim at minimizing the norm-squared of the control input to move the…

Optimization and Control · Mathematics 2007-05-23 Islam I. Hussein , Anthony M. Bloch

The goal of this paper is to provide conditions under which a quantum stochastic differential equation (QSDE) preserves the commutation and anticommutation relations of the SU(n) algebra, and thus describes the evolution of an open n-level…

Optimization and Control · Mathematics 2013-03-15 Luis A. Duffaut Espinosa , Z. Miao , I. R. Petersen , V. Ugrinovskii , M. R. James

Qubits on solid state devices could potentially provide the rapid control necessary for developing scalable quantum information processors. Materials innovation and design breakthroughs have increased functionality and coherence of qubits…

A finite dimensional operator that commutes with some symmetry group admits quotient operators, which are determined by the choice of associated representation. Taking the quotient isolates the part of the spectrum supporting the chosen…

Mathematical Physics · Physics 2023-11-30 Ram Band , Gregory Berkolaiko , Christopher H. Joyner , Wen Liu

There is an abstract notion of connection in any tangent category. In this paper, we show that when applied to the tangent category of affine schemes, this recreates the classical notion of a connection on a module (and similarly, in the…

Category Theory · Mathematics 2024-11-22 G. S. H. Cruttwell , Jean-Simon Pacaud Lemay , Elias Vandenberg

Complete controllability of degenerate quantum system using quantum accessor modeled as a qubit chain with nearest neighborhood coupling is investigated. Sufficient conditions on the length of accessor and the way of coupling between…

Quantum Physics · Physics 2013-12-30 Si Li , Z. F. Jiang , H. C. Fu

We consider the structure of classes of curves on a projective simply connected surface for which fundamental groups of the complements admit free quotients having rank greater than one with irreducible components belonging to a selected…

Algebraic Geometry · Mathematics 2021-11-16 Jose Ignacio Cogolludo , Anatoly Libgober

Even though organic conductors have complicated crystalline structure with low symmetry and large unit cell, band structure calculations predict multiband quasi-two dimensional electronic structure yielding very simple Fermi surface in most…

Strongly Correlated Electrons · Physics 2015-06-04 Alain Audouard , Jean-Yves Fortin