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Past exam of the mathematical methods I course of the University of Oxford / 2015 resit / 11 / b

Codex (@codex,  0) ... Physics course of the University of Oxford Year 1 of the physics course of the University of Oxford Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2015 resit 11
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b
A power of a diagonal matrix acts entrywise. Thus
Dn=diag((−1)n,2n,1).​
(1)
From A=BDB−1, adjacent B−1B factors cancel in repeated multiplication, giving
An=BDnB−1.​
(2)
This is the matrix power rule for a similarity transformation, proved directly rather than by taking powers of separate noncommuting factors.

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