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Cavalieri's quadrature formula
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Cavalieri's quadrature formula : ウィキペディア英語版
Cavalieri's quadrature formula

In calculus, Cavalieri's quadrature formula, named for 17th-century Italian mathematician Bonaventura Cavalieri, is the integral
:\int_0^a x^n\,dx = \tfrac\, a^ \qquad n \geq 0,
and generalizations thereof. This is the definite integral form; the indefinite integral form is:
:\int x^n\,dx = \tfrac\, x^ + C \qquad n \neq -1.
There are additional forms, listed below. Together with the linearity of the integral, this formula allows one to compute the integrals of all polynomials.
The term "quadrature" is a traditional term for area; the integral is geometrically interpreted as the area under the curve ''y'' = ''x''''n''. Traditionally important cases are ''y'' = ''x''2, the quadrature of the parabola, known in antiquity, and ''y'' = 1/''x'', the quadrature of the hyperbola, whose value is a logarithm.
== Forms ==


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