Let B be an n × n matrix over a field F, and suppose that B has minimal polynomial x2 +x +1. (i) Show that B is invertible. (ii) Prove that the minimal polynomial of B-1 is also x? + x +1. (iii) Prove that if F = C and n is odd, then B is not similar to B-1. (iv) Prove that if F = R and n is even, then B is similar to B-1.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Let B be an n x n matrix over a field F, and suppose that B has minimal polynomial
x2 + x + 1.
(i) Show that B is invertible.
(ii)
(iii)
(iv)
Prove that the minimal polynomial of B-1 is also x? + x + 1.
Prove that ifF = C and n is odd, then B is not similar to B-1.
Prove that if F = R and n is even, then B is similar to B-1.
Transcribed Image Text:Let B be an n x n matrix over a field F, and suppose that B has minimal polynomial x2 + x + 1. (i) Show that B is invertible. (ii) (iii) (iv) Prove that the minimal polynomial of B-1 is also x? + x + 1. Prove that ifF = C and n is odd, then B is not similar to B-1. Prove that if F = R and n is even, then B is similar to B-1.
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