Let F/K be a field extension and a, b E F be algebraic over K. If a has degree m over K and b 0 has degree n over K, prove that the elements a+b, ab, ab, ab-¹ have degree at most mn over K.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter8: Polynomials
Section8.3: Factorization In F [x]
Problem 7E: Corollary requires that be a field. Show that each of the following polynomials of positive degree...
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Field Extension 

P, pa prime. Prove
that if c E F, c# K, then F = K (c).
Let F/K be a field extension and a, b E F be algebraic over K. If a has
degree m over K and b 0 has degree n over K, prove that the elements
a+b, ab, a - b, ab-1 have degree at most mn over K.
Transcribed Image Text:P, pa prime. Prove that if c E F, c# K, then F = K (c). Let F/K be a field extension and a, b E F be algebraic over K. If a has degree m over K and b 0 has degree n over K, prove that the elements a+b, ab, a - b, ab-1 have degree at most mn over K.
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