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Jackson integral : ウィキペディア英語版
Jackson integral
In q-analog theory, the Jackson integral series in the theory of special functions that expresses the operation inverse to q-differentiation.
The Jackson integral was introduced by Frank Hilton Jackson.
== Definition ==
Let ''f''(''x'') be a function of a real variable ''x''. The Jackson integral of ''f'' is defined by the following series expansion:
: \int f(x) d_q x = (1-q)x\sum_^q^k f(q^k x).
More generally, if ''g''(''x'') is another function and ''D''''q''''g'' denotes its ''q''-derivative, we can formally write
: \int f(x) D_q g d_q x = (1-q)x\sum_^q^k f(q^k x) D_q g(q^k x) = (1-q)x\sum_^q^k f(q^k x)\fracx)}, or
: \int f(x) d_q g(x) = \sum_^ f(q^k x)(g(q^x)-g(q^x)),
giving a ''q''-analogue of the Riemann–Stieltjes integral.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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