We consider groupoids on $\{ 1,2,..,d\}^\mathbb{ N}$, cocycles and the counting measure as transverse function. We generalize results relating quasi-invariant probabilities with eigenprobabilities for the dual of the Ruelle operator. We assume a mild compatibility of the groupoid with the symbolic structure. We present a generalization of the Ruelle operator - the Haar-Ruelle operator - taking into account the Haar structure. We consider continuous and also H\"older cocycles. IFS with weights appears in our reasoning in the H\"older case.
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