Let V be a finite-dimensional vector space over a field F, and let T:V → V be a linear transformation whose fifth power T is the identity. (a) Show that T is always diagonalisable if F is the field of complex numbers. (b) If F is the field of real numbers, show that T is only diagonalisable if it is equal to the identity.
Let V be a finite-dimensional vector space over a field F, and let T:V → V be a linear transformation whose fifth power T is the identity. (a) Show that T is always diagonalisable if F is the field of complex numbers. (b) If F is the field of real numbers, show that T is only diagonalisable if it is equal to the identity.
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 2TFE
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