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linearity of integration : ウィキペディア英語版
linearity of integration
In calculus, the integral of any linear combination of functions equals the same linear combination of the integrals of the functions; this property is known as linearity of integration.〔.〕 It is a fundamental property of the integral that encapsulates in a single rule two simpler rules of integration, the sum rule (the integral of the sum of two functions equals the sum of the integrals) and the constant factor rule (the integral of a constant multiple of a function equals a constant multiple of the integral).〔.〕 Linearity of integration is related to the linearity of summation, since integrals are thought of as infinite sums.
==Statement and derivation==
Let and be functions. Now consider:
:\int (af(x)+bg(x))\, dx.
By the sum rule in integration, this is
:\int af(x)\, dx+\int bg(x)\, dx.
By the constant factor rule in integration, this reduces to
:a\int f(x)\, dx+b\int g(x)\, dx.
Hence we have
:\int (af(x)+bg(x))\, dx=a\int f(x)\, dx+b\int g(x)\, dx.
It is also possible to infer linearity of integration as a consequence of linearity of differentiation.〔.〕

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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