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arxiv: 0711.0162 · v4 · submitted 2007-11-01 · 🧮 math.LO

Definable Davies' Theorem

classification 🧮 math.LO
keywords daviessigmatheoremanalogueconstructibledefinableeveryfollowing
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We prove the following analogue of a Theorem of R.O. Davies: Every $\Sigma^1_2$ function $f:\R\times\R\to\R$ can be represented as a sum of rectangular $\Sigma^1_2$ functions if and only if all reals are constructible.

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