Algebraics

Algebraics represents the domain of algebraic numbers, as in x∈Algebraics.

Examples

Test if a number is algebraic:

Element[Sqrt[2], Algebraics]
(* True *)

Solve over algebraic numbers:

Solve[x^2 == 2, x, Algebraics]
(* {{x -> -Sqrt[2]}, {x -> Sqrt[2]}} *)

Please visit the official Wolfram Language Reference for more details.