Can someone explain to me why in this equation (attached)(adsbygoogle = window.adsbygoogle || []).push({});

where ρ(t)=[itex]\sum[/itex]δ(t-ti) , dirac funtion.

in the left side we have the sum over h(t-ti) instead of the sum over h(ti) ?

It seems to me that the integral would work summing 1*h(t1)+1*h(t2)+...+1*h(ti) for all ti smaller than t.

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# Delta function

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