Theory of Intelligence
11TH•Mathematics•Matrices And Determinants•Exercise 4.2

Key facts

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Key facts

If ∣A∣≠0|A|\ne 0, then:

A−1=1∣A∣adj⁡(A)A^{-1}=\frac{1}{|A|}\operatorname{adj}(A)

and:

AA−1=A−1A=IAA^{-1}=A^{-1}A=I

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