A field F is said to be formally real if -1 can not be expressed asa su

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.6: Algebraic Extensions Of A Field
Problem 12E
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A field F is said to be formally real if − 1 can not be expressed asa sum of squares of
elements of F. Let F be formally real and let a be some algebraic closure of F such that
dimF (F(a) is odd. Showthat F(a) is also formally real.
Transcribed Image Text:A field F is said to be formally real if − 1 can not be expressed asa sum of squares of elements of F. Let F be formally real and let a be some algebraic closure of F such that dimF (F(a) is odd. Showthat F(a) is also formally real.
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