### Spectra of Monadic Second-Order Formulas with One Unary Function

by Gurevich and Shelah. [GuSh:536]

Proc 18th Annual IEEE Symposium on Logic in Computer Science, 2003

We establish the eventual periodicity of the spectrum of
any monadic second-order formula where:
(i) all relation symbols, except equality, are unary, and
(ii) there is only one function symbol and that symbol is unary.

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