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Dimensions of the popcorn graph

Abstract: The ‘popcorn function’ is a well-known and important example in real analysis with many interesting features. We prove that the box dimension of the graph of the popcorn function is 4/3, as well as computing the Assouad dimension and Assouad spectrum. The main ingredients include Duffin-Schaeffer type estimates from Diophantine approximation and the Chung-Erdős inequality from probability theory.
Keywords: Popcorn function / Thomae function / box dimension / Assouad dimension / Assouad spectrum
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