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cant understand the red arrow transition

i changes the intervals and i cuts half of the arguent inside the integral

i cant see why

?

regarding the interval change

the H function is 1 in a certain interval

so if they change the integrval then its no longer H inside

because we have taken the '1' part of the H

??

regarding the cutting in half the argument inside the integral

i have no idea

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# Convolution integral question

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