In physics, an observable is a physical property or physical quantity that can be measured. In classical mechanics, an observable is a real-valued "function"...

The observable universe is a ball-shaped region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes...

Observability is a measure of how well internal states of a system can be inferred from knowledge of its external outputs. In control theory, the observability...

{y}}(t)={\boldsymbol {Cx}}(t)+{\boldsymbol {Du}}(t)\end{array}}} is observable, where A {\displaystyle {\boldsymbol {A}}} , B {\displaystyle {\boldsymbol...

In mathematics, in the representation theory of algebraic groups, an observable subgroup is an algebraic subgroup of a linear algebraic group whose every...

Stealth technology, also termed low observable technology (LO technology), is a sub-discipline of military tactics and passive and active electronic countermeasures...

In software engineering, more specifically in distributed computing, observability is the ability to collect data about programs' execution, modules' internal...

metaphysics. A Ramsey sentence aims at rendering propositions containing non-observable theoretical terms (terms employed by a theoretical language) clear by...

partially observable system is one in which the entire state of the system is not fully visible to an external sensor. In a partially observable system the...

can only be inferred indirectly through a mathematical model from other observable variables that can be directly observed or measured. Such latent variable...

programming languages. ReactiveX is an API for asynchronous programming with observable streams. Asynchronous programming allows programmers to call functions...

The no-observed-adverse-effect level (NOAEL) denotes the level of exposure of an organism, found by experiment or observation, at which there is no biologically...

In quantum mechanics, a complete set of commuting observables (CSCO) is a set of commuting operators whose common eigenvectors can be used as a basis...

A partially observable Markov decision process (POMDP) is a generalization of a Markov decision process (MDP). A POMDP models an agent decision process...

A phenomenon (pl.: phenomena), sometimes spelled phaenomenon, is an observable event. The term came into its modern philosophical usage through Immanuel...

James A. Yorke (born August 3, 1941) is a Distinguished University Research Professor of Mathematics and Physics and former chair of the Mathematics Department...

different situations, depending on whether every sequential state is observable or not, and whether the system is to be adjusted on the basis of observations...

variables. Observability is a measure for how well internal states of a system can be inferred by knowledge of its external outputs. The observability and controllability...

role, it is important that evidence is public and uncontroversial, like observable physical objects or events and unlike private mental states, so that evidence...

expanded into an age and size that is physically only in parts observable as the observable universe, which is approximately 93 billion light-years in diameter...

occurring physical entity, association, or structure that exists within the observable universe. In astronomy, the terms object and body are often used interchangeably...

observational evidence (WMAP, BOOMERanG, and Planck for example) imply that the observable universe is flat to within a 0.4% margin of error of the curvature density...

existence, nature, properties, qualities or relations are not directly observable by humans. In philosophy of science, typical examples of "unobservables"...

light-years away and stretches across roughly a 15th of the radius of the observable universe. It was discovered using data from the Sloan Digital Sky Survey...

In high energy physics, event shapes observables are quantities used to characterize the geometry of the outcome of a collision between high energy particles...

persistence of these former inhabitants' genes among the modern Uyghurs is both observable and scientifically demonstrable.32 Early Chinese sources describe the...

Venus is the second planet from the Sun. It is a terrestrial planet and is the closest in mass and size to its orbital neighbour Earth. Venus is notable...

or black hole cosmological model) is a cosmological model in which the observable universe is the interior of a black hole. Such models were originally...

estimated at 2.5 × 1042 kilograms, and the total mass of all the stars in the observable universe is estimated at 2 × 1052 kg. To put this in perspective, the...

energy of the system is a constant of motion (a conserved quantity). An observable quantity Q will be a constant of motion if it commutes with the Hamiltonian...