The Heaviside step function, denoted by $H(t)$, is defined as follows:
$$
H(t)= \begin{cases}0 & \text { for } t<0 \\ 1 & \text { for } t\geq0\end{cases}
$$
We can shift the Heaviside function to the right by $a$ units to get $H(t-a)$, which is 0 for $t<a$ and 1
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