Theory of Intelligence
11TH•Mathematics•Matrices And Determinants•Exercise 4.1

Key idea

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Key idea

For an n×nn\times n identity matrix InI_n:

InA=A,AIn=AI_nA=A,\qquad AI_n=A

This follows from the Kronecker delta identity:

δik={1,i=k0,i≠k\delta_{ik}=\begin{cases}1,& i=k\\0,& i\ne k\end{cases}

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