For non-integer β1, β2 > 1, the Rényi-Parry measures coincide if and only if β1 is a root of x^2 − qx − p = 0 with p ≤ q and β2 = β1 + 1.
Bertrand-Mathis
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The coincidence of R\'{e}nyi-Parry measures for $\beta$-transformation
For non-integer β1, β2 > 1, the Rényi-Parry measures coincide if and only if β1 is a root of x^2 − qx − p = 0 with p ≤ q and β2 = β1 + 1.