BabelNet

bn:03613893n

Noun Concept

構成可能数作図可能数作図可能な数

In geometry and algebra, a real number r {\displaystyle r} is constructible if and only if, given a line segment of unit length, a line segment of length | r | {\displaystyle |r|} can be constructed with compass and straightedge in a finite number of steps. Wikipedia

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