The complexity of the collection of countable linear orders of the form I + I

Journal of Symbolic Logic 64 (4):1519-1526 (1999)
Abstract
First we prove that the set of countable linear orders of the form I + I form a complete analytic set. As a consequence of this we improve a result of Humke and Laczkovich, who showed in [HL] that the set of functions of the form f ⚬ f form a true analytic set in C[0, 1]. We show that these functions form a complete analytic set, solving a problem mentioned on p. 215 of [K1] and on p. 4 of [B]
Keywords Descriptive Set Theory   Complete Analytic Set   Linear Order   Iterates of Continuous Functions
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