Results 31 to 40 of about 1,226,242 (181)

Estimating numerical errors due to operator splitting in global atmospheric chemistry models: Transport and chemistry

open access: yes, 2015
We present upper bounds for the numerical errors introduced when using operator splitting methods to integrate transport and non-linear chemistry processes in global chemical transport models (CTM).
Santillana, Mauricio   +2 more
core   +1 more source

Applied Koopman Operator Theory for Power Systems Technology [PDF]

open access: yes, 2016
Koopman operator is a composition operator defined for a dynamical system described by nonlinear differential or difference equation. Although the original system is nonlinear and evolves on a finite-dimensional state space, the Koopman operator itself ...
Hikihara, Takashi   +3 more
core   +2 more sources

Operator space and operator system analogs of Kirchberg's nuclear embedding theorem

open access: yes, 2015
The Gurarij operator space $\mathbb{NG}$ introduced by Oikhberg is the unique separable $1$-exact operator space that is approximately injective in the category of $1$-exact operator spaces and completely isometric linear maps.
Lupini, Martino
core   +1 more source

Linear identification of nonlinear systems: A lifting technique based on the Koopman operator [PDF]

open access: yes, 2016
We exploit the key idea that nonlinear system identification is equivalent to linear identification of the socalled Koopman operator. Instead of considering nonlinear system identification in the state space, we obtain a novel linear identification ...
Goncalves, Jorge, Mauroy, Alexandre
core   +2 more sources

Assistive Planning in Complex, Dynamic Environments: a Probabilistic Approach

open access: yes, 2015
We explore the probabilistic foundations of shared control in complex dynamic environments. In order to do this, we formulate shared control as a random process and describe the joint distribution that governs its behavior. For tractability, we model the
Trautman, Pete
core   +1 more source

Koopman Operator and its Approximations for Systems with Symmetries [PDF]

open access: yes, 2019
Nonlinear dynamical systems with symmetries exhibit a rich variety of behaviors, including complex attractor-basin portraits and enhanced and suppressed bifurcations.
Crutchfield, James P.   +4 more
core   +3 more sources

Dilatations of Linear Operators

open access: yesСовременная математика: Фундаментальные направления, 2020
The article is devoted to building various dilatations of linear operators. The explicit construction of a unitary dilation of a compression operator is considered.
Yu. L. Kudryashov
doaj   +1 more source

Expanding direction of the period doubling operator

open access: yes, 1991
We prove that the period doubling operator has an expanding direction at the fixed point. We use the induced operator, a ``Perron-Frobenius type operator'', to study the linearization of the period doubling operator at its fixed point.
Dennis Sullivan   +10 more
core   +1 more source

Continuous-Like Linear Operators on Bilinear Spaces

open access: yesJournal of Mathematical and Fundamental Sciences, 2020
This paper introduces continuous-like linear operators on bilinear spaces as a generalization of continuous linear operators on Hilbert spaces. It is well known that the existence of the adjoint of a linear operator on a Hilbert space is equivalent to ...
Sabarinsyah Sabarinsyah   +2 more
doaj   +1 more source

Metric characterizations II

open access: yes, 2012
The present paper is a sequel to our paper "Metric characterization of isometries and of unital operator spaces and systems". We characterize certain common objects in the theory of operator spaces (unitaries, unital operator spaces, operator systems ...
Blecher, David P., Neal, Matthew
core   +1 more source

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