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complex quadratic polynomial : ウィキペディア英語版
complex quadratic polynomial

A complex quadratic polynomial is a quadratic polynomial whose coefficients and variable are complex numbers.
==Forms==
When the quadratic polynomial has only one variable (univariate), one can distinguish its 4 main forms:
* The general form: f(x) = a_2 x^2 + a_1 x + a_0 \qquad \, where \qquad a_2 \ne 0
* The factored form used for logistic map f_r(x) = r x ( 1-x ) \,
* f_(x) = x^2 + e^ x \, which has an indifferent fixed point with multiplier \lambda = e^ \, at the origin〔(Michael Yampolsky, Saeed Zakeri : Mating Siegel quadratic polynomials. )〕
* The monic and centered form, f_c(x) = x^2 +c\,
The monic and centered form has the following properties:
* It is the simplest form of a nonlinear function with one coefficient (parameter),
* It is an unicritical polynomial, i.e. it has one critical point,
* It is a centered polynomial (the sum of its critical points is zero),〔Bodil Branner: Holomorphic dynamical systems in the complex plane. Mat-Report No 1996-42. Technical University of Denmark〕
* It can be postcritically finite, i.e. If the orbit of the critical point is finite. It is when critical point is periodic or preperiodic.〔(Alfredo Poirier : On Post Critically Finite Polynomials Part One: Critical Portraits )〕
* It is a unimodal function,
* It is a rational function,
* It is an entire function.

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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