Multiple Perron-Frobenius operators.
A cycle expansion technique for discrete sums of several PF operators, similar to the one used in the standard classical dynamical zeta-function formalism is constructed. It is shown that the corresponding expansion coefficients show an interesting universal behavior, which illustrates the details of the interference between the particular mappings entering the sum.
Dabaghian
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Department of Physics, Wesleyan University, Middletown, CT 06459-0155, USA. ydabaghian@wesleyan.edu