Definition:Rationally Expressible Number

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A number is rationally expressible if its square is rational.

Thus, the set of the rationally expressible numbers is $\set {x \in \R : x^2 \in \Q}$.


This page uses terminologies invented by $\mathsf{Pr} \infty \mathsf{fWiki}$, which are not expected to be seen outside $\mathsf{Pr} \infty \mathsf{fWiki}$, namely: rationally expressible.

Also see