 06285 Tetsuya Hattori
 Uniqueness of fixed point of a twodimensional map obtained as a generalization of the renormalization group map associated to the selfavoiding paths on gaskets
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Oct 9, 06

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Abstract. Let $W(x,y) = a x^3 + b x^4 + f_5 x^5 + f_6 x^6 + (3 a x^2)^2 y + g_5 x^5 y + h_3 x^3 y^2 + h_4 x^4 y^2 + n_3 x^3 y^3 + a_{24} x^2 y^4 + a_{05} y^5 + a_{15} x y^5 + a_{06} y^6$,
and $X=\frac{\partial W}{\partial x}$, $Y=\frac{\partial W}{\partial y}$,
where the coefficients are nonnegative constants, with $a>0$,
such that $X^{2}(x,x^{2})Y(x,x^{2})$ is a polynomial of $x$ with
nonnegative coefficients.
Examples of the 2 dimensional map $\Phi:\ (x,y)\mapsto (X(x,y),Y(x,y))$
satisfying the conditions are the renormalization group (RG) map
(modulo change of variables) for the restricted selfavoiding paths
on the 3 and 4 dimensional pregaskets.
We prove that there exists a unique fixed point $(x_f,y_f)$ of $\Phi$
in the invariant set $\{(x,y)\in R^2\mid x^2\ge y\}\setminus\{0\}$.
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