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  2. Quantum calculus - Wikipedia

    en.wikipedia.org/wiki/Quantum_calculus

    For 0 < q < 1, the series converges to a function F(x) on an interval (0,A] if |f(x)x α | is bounded on the interval (0, A] for some 0 ≤ α < 1. The q-integral is a Riemann–Stieltjes integral with respect to a step function having infinitely many points of increase at the points q j..The jump at the point q j is q j. Calling this step ...

  3. Quantum stochastic calculus - Wikipedia

    en.wikipedia.org/wiki/Quantum_stochastic_calculus

    Quantum stochastic calculus is a generalization of stochastic calculus to noncommuting variables. [1] The tools provided by quantum stochastic calculus are of great use for modeling the random evolution of systems undergoing measurement , as in quantum trajectories.

  4. List of theorems called fundamental - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems_called...

    For example, the fundamental theorem of calculus gives the relationship between differential calculus and integral calculus. [1] The names are mostly traditional, so that for example the fundamental theorem of arithmetic is basic to what would now be called number theory. [2]

  5. Canonical commutation relation - Wikipedia

    en.wikipedia.org/wiki/Canonical_commutation_relation

    An analogous relation holds for the spin operators. Here, for L x and L y , [12] in angular momentum multiplets ψ = |ℓ,m , one has, for the transverse components of the Casimir invariant L x 2 + L y 2 + L z 2, the z-symmetric relations L x 2 = L y 2 = (ℓ (ℓ + 1) − m 2) ℏ 2 /2 , as well as L x = L y = 0 .

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    It is fundamentally the study of the relationship of variables that depend on each other. Calculus was expanded in the 18th century by Euler with the introduction of the concept of a function and many other results. [40] Presently, "calculus" refers mainly to the elementary part of this theory, and "analysis" is commonly used for advanced parts ...

  7. q-analog - Wikipedia

    en.wikipedia.org/wiki/Q-analog

    In mathematics, a q-analog of a theorem, identity or expression is a generalization involving a new parameter q that returns the original theorem, identity or expression in the limit as q1. Typically, mathematicians are interested in q -analogs that arise naturally, rather than in arbitrarily contriving q -analogs of known results.

  8. q-derivative - Wikipedia

    en.wikipedia.org/wiki/Q-derivative

    The q-derivative of a function f(x) is defined as [1] [2] [3] () = ().It is also often written as ().The q-derivative is also known as the Jackson derivative.. Formally, in terms of Lagrange's shift operator in logarithmic variables, it amounts to the operator

  9. Nonstandard analysis - Wikipedia

    en.wikipedia.org/wiki/Nonstandard_analysis

    The standard way to resolve these debates is to define the operations of calculus using limits rather than infinitesimals. Nonstandard analysis [1] [2] [3] instead reformulates the calculus using a logically rigorous notion of infinitesimal numbers. Nonstandard analysis originated in the early 1960s by the mathematician Abraham Robinson. [4] [5 ...

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