Results 51 to 60 of about 850,072 (303)
A Non-commutative Real Nullstellensatz Corresponds to a Non-commutative Real Ideal; Algorithms
, 2012 This article takes up the challenge of extending the classical Real Nullstellensatz of Dubois and Risler to left ideals in a *-algebra A. After introducing the notions of non-commutative zero sets and real ideals, we develop three themes related to our ...
Cimpric, Jaka +3 more
core +1 more source
Quotients and invariants of AS-sets equipped with a finite group action
, 2019 Using the geometric quotient of a real algebraic set by the action of a finite group G, we construct invariants of GAS sets with respect to equivariant homeomorphisms with AS-graph, including additive invariants with values in ...
Priziac, Fabien
core +3 more sources
Journal of Optimization, Differential Equations and Their Applications, 2020 A problem of description of algebraic invariants for a linear control system that determine its structure is considered. With the help of these invariants, the equivalence problem of two linear time-invariant control systems with respect to actions of ...
Vasiliy Ye. Belozyorov +2 more
doaj +1 more source
International Journal of Adaptive Control and Signal Processing, EarlyView.This paper proposes two projector‐based Hopfield neural network (HNN) estimators for online, constrained parameter estimation under time‐varying data, additive disturbances, and slowly drifting physical parameters. The first is a constraint‐aware HNN that enforces linear equalities and inequalities (via slack neurons) and continuously tracks the ...
Miguel Pedro Silva
wiley +1 more source
Computing the Volume of Compact Semi-Algebraic Sets [PDF]
International Symposium on Symbolic and Algebraic Computation, 2019 Let S\subset \bR^n be a compact basic semi-algebraic set defined as the real solution set of multivariate polynomial inequalities with rational coefficients.
Pierre Lairez +2 more
semanticscholar +1 more source
Algebraic approximation of germs of real analytic sets [PDF]
Proceedings of the American Mathematical Society, 2010 Summary: Two subanalytic subsets of \( \mathbb{R}^n\) are \( s\)-equivalent at a common point, say \( O\), if the Hausdorff distance between their intersections with the sphere centered at \( O\) of radius \( r\) goes to zero faster than \( r^s\).
FERRAROTTI M +2 more
openaire +5 more sources
International Journal of Adaptive Control and Signal Processing, EarlyView.This work introduces an adaptive human pilot model that captures pilot time‐delay effects in adaptive control systems. The model enables the prediction of pilot–controller interactions, facilitating safer integration and improved design of adaptive controllers for piloted applications.
Abdullah Habboush, Yildiray Yildiz
wiley +1 more source
Pirashvili–Richter-type theorems for the reflexive and dihedral homology theories
Comptes Rendus. MathématiqueReflexive homology and dihedral homology are the homology theories associated to the reflexive and dihedral crossed simplicial groups respectively. The former has recently been shown to capture interesting information about $C_2$-equivariant homotopy ...
Graves, Daniel
doaj +1 more source
Backbone Heterojunction Photocatalysts for Efficient Sacrificial Hydrogen Production
Advanced Functional Materials, EarlyView.Herein, a ‘single‐component’ organic semiconductor photocatalyst is presented in which a molecular donor is bonded to a polymer acceptor. The resultant material demonstrates exceptional photocatalytic activity for hydrogen evolution in aqueous triethylamine with an outstanding external quantum efficiency of 38% at 420 nm.
Richard J. Lyons +11 more
wiley +1 more source
Dupin Cyclides as a Subspace of Darboux Cyclides
MathematicsDupin cyclides are interesting algebraic surfaces used in geometric design and architecture to join canal surfaces smoothly and to construct model surfaces.
Jean Michel Menjanahary +1 more
doaj +1 more source