functional operator - ορισμός. Τι είναι το functional operator
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Τι (ποιος) είναι functional operator - ορισμός

CONCEPT IN CALCULUS OF VARIATION
Functional derivative(physics); Variational derivative; Functional deferentiation; Functional derivative operator

Functional beverage         
NON-ALCOHOLIC DRINK THAT CONTAINS HERBS, VITAMINS, MINERALS, AMINO ACIDS OR ADDITIONAL RAW FRUIT OR VEGETABLES
Bepherages; Functional beverages; Functional drinks; Functional drink
A functional beverage is a conventional liquid food marketed to highlight specific product ingredients or supposed health benefit.
Transfer operator         
PUSHFORWARD ON THE SPACE OF MEASURABLE FUNCTIONS
Ruelle operator; Perron-Frobenius operator; Perron-Frobenius Operator; Frobenius-Perron operator; Bernoulli operator; Ruelle-Frobenius-Perron operator; Frobenius–Perron operator; Perron–Frobenius operator
In mathematics, the transfer operator encodes information about an iterated map and is frequently used to study the behavior of dynamical systems, statistical mechanics, quantum chaos and fractals. In all usual cases, the largest eigenvalue is 1, and the corresponding eigenvector is the invariant measure of the system.
Bounded operator         
LINEAR TRANSFORMATION L BETWEEN NORMED VECTOR SPACES X AND Y FOR WHICH THE RATIO OF THE NORM OF L(V) TO THAT OF V IS BOUNDED BY THE SAME NUMBER, OVER ALL NON-ZERO VECTORS V IN X
Bounded linear map; Bounded linear operator; Continuous operator; Bounded linear function; Bounded operators; Bounded linear functional; Bounded linear transform; Bounded Linear Form; Bonded linear operator
In functional analysis and operator theory, a bounded linear operator is a linear transformation L : X \to Y between topological vector spaces (TVSs) X and Y that maps bounded subsets of X to bounded subsets of Y.

Βικιπαίδεια

Functional derivative

In the calculus of variations, a field of mathematical analysis, the functional derivative (or variational derivative) relates a change in a functional (a functional in this sense is a function that acts on functions) to a change in a function on which the functional depends.

In the calculus of variations, functionals are usually expressed in terms of an integral of functions, their arguments, and their derivatives. In an integral L of a functional, if a function f is varied by adding to it another function δf that is arbitrarily small, and the resulting integrand is expanded in powers of δf, the coefficient of δf in the first order term is called the functional derivative.

For example, consider the functional

where f ′(x) ≡ df/dx. If f is varied by adding to it a function δf, and the resulting integrand L(x, f +δf, f '+δf ′) is expanded in powers of δf, then the change in the value of J to first order in δf can be expressed as follows: where the variation in the derivative, δf was rewritten as the derivative of the variation (δf) ′, and integration by parts was used.