# Tarski's theorem

Several results obtained by the noted

logician Alfred Tarski are commonly referred to as**Tarski's theorem**:*Tarski's theorem on

real closed field s established the decidability of the first-order theory ofreal number s.

*TheKnaster-Tarski theorem is a result aboutcomplete lattice s.

*Tarski's undefinability theorem (also known as Tarski's truth theorem) is a semantic counterpart to Gödel's incompleteness theorem.

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