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The list ${\displaystyle \{\ell _{1},\ell _{2},\ldots \))$ seems to use set notation, but the example ${\displaystyle \((\frac {1}{3)),{\frac {1}{9)),{\frac {1}{9)),\ldots \))$ includes a repetition ${\displaystyle \ell _{2}=\ell _{3))$ in the list. The source "Riemann Zeroes and Phase Transitions via the Spectral Operator on Fractal Strings" uses curly braces but describes the lengths as forming a sequence, in which case would it be more appropriate to use a sequence of lengths? C7XWiki (talk) 06:35, 24 August 2023 (UTC)[reply]