Math 2.0

Number theory Definition

Algebraic number

Definition

A complex number α\alpha is algebraic if there is a nonzero polynomial ff with rational coefficients such that f(α)=0f(\alpha) = 0. The degree of α\alpha is the smallest degree of such a polynomial.

Remarks

One may use integer coefficients instead, by clearing denominators. Examples are each rational number (degree 11), 2\sqrt{2} and ii (degree 22), and 23\sqrt[3]{2} (degree 33). The algebraic numbers form a field, and this field is countable. A complex number that is not algebraic is transcendental.

Where this leads

8 pages build on this one.

Further reading

  1. Web https://en.wikipedia.org/wiki/Algebraic_number, lead section
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