Galoistheory

Ga·lois theory (găl-wäʹ) n.

The part of algebra concerned with the relation between solutions of a polynomial equation and the fields containing those solutions. It gives conditions under which the solutions can be expressed in terms of addition, subtraction, multiplication, division, and of the extraction of roots.

  [After ÉvaristeGalois (1811-1832), French mathematician.]

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