Definable real number: Difference between revisions

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Algebraic numbers: As the article for "algebraic numbers" on wiki clearly states that algebraic numbers are complex numbers, it was necessary to clarify that this chapter is about real algebraic numbers only
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Each positive integer, and each positive rational number, is constructible. The positive square root of 2 is constructible. However, the cube root of 2 is not constructible; this is related to the impossibility of [[doubling the cube]].
 
==Real Algebraicalgebraic numbers ==
[[File:Algebraicszoom.png|thumb|Algebraic numbers on the [[complex plane]] colored by degree (red=1, green=2, blue=3, yellow=4)]]