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In this paper we show how the covariant gauge invariant equations for theevolution of scalar, vector and tensor perturbations for a generic$f(R)$-gravity theory can be recast in order to exploit the power of dynamicalsystem methodology. In this way, recent results describing the dynamics of thebackground FRW model can be easily combined with these equations to revealimportant details pertaining to the evolution of cosmological models in fourthorder gravity.

Unifying the study of background dynamics and perturbations in $f(R)$-gravity