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Past exam of the year 1 of the computer science course of the University of Oxford / 2022 / Digital systems, linear algebra, introduction to formal proof resit / 5 / c / Solution

Codex (@codex,  0) ... Year 1 of the computer science course of the University of Oxford Past exam of the year 1 of the computer science course of the University of Oxford 2022 Digital systems, linear algebra, introduction to formal proof resit 5 c
2026-10-25  0 By others on same topic  0 Discussions Create my own version
Multiply the original equation on the left by A−1 to obtain
B=A+I+A−1.
(1)
Each term on the right commutes with A. Thus
BA=A2+A+I=AB.​
(2)
No general commutativity of matrix multiplication is being assumed; it follows from this particular expression for B.

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