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{{Short description|Real number uniquely specified by description}}
[[File:Square root of 2 triangle.svg|thumb|200px|The [[square root of 2]] is equal to the length of the [[hypotenuse]] of a [[right triangle]] with legs of length 1 and is therefore a '''constructible number''']]
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* ''[[Entscheidungsproblem]]''
* [[Ordinal definable set]]
* [[Richard's paradox]]
* [[Tarski's undefinability theorem]]
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