Proving Properties of $φ$-Representations with the Walnut Theorem-Prover

Abstract

We revisit a classic theorem of Frougny and Sakarovitch concerning automata for $φ$-representations, and show how to obtain it in a different and more computationally direct way. Using it, we can find simple, induction-free proofs of existing results in the literature about these representations, in a uniform and straightforward manner. In particular, we can easily and "automatically'' recover many of the results of recent papers of Dekking and Van Loon. We also obtain a number of new results on $φ$-representations.