The monadic theory of ω2

Abstract
Assume ZFC + “There is a weakly compact cardinal” is consistent. Then: (i) For every S ⊆ ω, ZFC + “S and the monadic theory of ω 2 are recursive each in the other” is consistent; and (ii) ZFC + “The full second-order theory of ω 2 is interpretable in the monadic theory of ω 2” is consistent.

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