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Secondary polynomials : ウィキペディア英語版
Secondary polynomials

In mathematics, the secondary polynomials \ associated with a sequence \ of polynomials orthogonal with respect to a density \rho(x) are defined by
: q_n(x) = \int_\mathbb\! \frac \rho(t)\,dt.
To see that the functions q_n(x) are indeed polynomials, consider the simple example of p_0(x)=x^3. Then,
:\begin q_0(x) & \rho(t)\,dt \\
& \rho(t)\,dt \\
&
= \int_\mathbb \! t^2\rho(t)\,dt
+ x\int_\mathbb \! t\rho(t)\,dt
+ x^2\int_\mathbb \! \rho(t)\,dt
\end
which is a polynomial x provided that the three integrals in t (the moments of the density \rho) are convergent.
==See also==

* Secondary measure

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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