Abstract
We investigate the mixing coefficients of interval maps satisfying Rychlik's conditions. A mixing Lasota-Yorke map is reverse ϕ-mixing. If its invariant density is uniformly bounded away from 0, it is ϕ-mixing iff all images of all orders are big, in which case it is ψ-mixing. Among β-transformations, non-ϕ-mixing is generic. In this sense, the asymmetry of ϕ-mixing is natural.
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