Quadratically closed field

In mathematics, a quadratically closed field is a field in which every element of the field has a square root in the field.[1][2]

Examples

Properties

Quadratic closure

A quadratic closure of a field F is a quadratically closed field which embeds in any other quadratically closed field containing F. A quadratic closure for any given F may be constructed as a subfield of the algebraic closure Falg of F, as the union of all quadratic extensions of F in Falg.[4]

Examples

References

  1. Lam (2005) p. 33
  2. 1 2 Rajwade (1993) p. 230
  3. 1 2 Lam (2005) p. 34
  4. 1 2 3 4 5 Lam (2005) p. 220
  5. Lam (2005) p.270
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