Note 4.1.3.3:

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Note 4.1.3.3:

If

$AB=BA$

,

$C=A+B$

then $e^{Ct}=e^{At}e^{Bt}$ . Note that if $A=nI$

$A=nI$

,

$AB=nIB=nB=Bn=BnI=BA$

.