Constructibility
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In mathematics, there are several notions of constructibility:
- a point in the Euclidean plane that can be constructed with unruled straightedge and compass. Also, any complex number associated to such a point; see constructible number.
- a regular polygon that can be constructed with unruled straightedge and compass; see constructible polygon.
- a theorem that can be proved by constructivist logic; see mathematical constructivism.
- a set in Kurt Gödel's universe L, which may be constructed by transfinite application of certain constructions in set theory; see constructible universe.