Multiple codings of self-similar sets with overlaps
Multiple codings of self-similar sets with overlaps
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DOI:
10.1016/j.aam.2020.102146
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发表时间:
2021-03
期刊:
影响因子:
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通讯作者:
K. Dajani;Kan Jiang;Derong Kong;Wenxia Li;Lifeng Xi
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文献类型:
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作者:
K. Dajani;Kan Jiang;Derong Kong;Wenxia Li;Lifeng Xi
In this paper we consider a general class E of self-similar sets with complete overlaps. Given a self-similar iterated function system Φ=(E,{f i} i= 1 m)∈ E on the real line, for each point x∈ E we can find a sequence (i k)= i 1 i 2…∈{1,…, m} N, called a coding of x, such that x= lim n→∞ f i 1∘ f i 2∘⋯∘ f i n (0). For k= 1, 2,…, ℵ 0 or 2 ℵ 0 we investigate the subset U k (Φ) which consists of all x∈ E having precisely k different codings. Among several equivalent characterizations we show that U 1 (Φ) is closed if and only if U ℵ 0 (Φ) is an empty set. Furthermore, we give explicit formulae for the Hausdorff dimension of U k (Φ), and show that the corresponding Hausdorff measure of U k (Φ) is always infinite for any k≥ 2. Finally, we explicitly calculate the local dimension of the self-similar measure at each point in U k (Φ) and U ℵ 0 (Φ).