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Rational difference equation : ウィキペディア英語版
Rational difference equation
A rational difference equation is a nonlinear difference equation of the form〔Skellam, J.G. (1951). “Random dispersal in theoretical populations”, ''Biometrika'' 38 196−–218, eqns (41,42)〕〔(Dynamics of third-order rational difference equations with open problems and Conjectures )〕〔(Dynamics of Second-order rational difference equations with open problems and Conjectures )〕〔Newth, Gerald, "World order from chaotic beginnings", ''Mathematical Gazette'' 88, March 2004, 39-45.〕
: x_ = \frac}}~,
where the initial conditions x_, x_,\dots, x_ are such that the denominator never vanishes for any .
==First-order rational difference equation==
A first-order rational difference equation is a nonlinear difference equation of the form
: w_ = \frac.
When a,b,c,d and the initial condition w_ are real numbers, this difference equation is called a Riccati difference equation.〔
Such an equation can be solved by writing w_t as a nonlinear transformation of another variable x_t which itself evolves linearly. Then standard methods can be used to solve the linear difference equation in x_t.

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