$a_{-i}=0$ for all positive i. We have the recurrence
$ a_n = \sum_{i=1}^\infty b_ia_{n-m_i} $
Where $m_i>0$ for all $i$.
$a_{-i}=0$ for all positive i. We have the recurrence
$ a_n = \sum_{i=1}^\infty b_ia_{n-m_i} $
Where $m_i>0$ for all $i$.
In signal processing, this is a kind of on IIR filter or in stochastics this is similar to an auto regressive process.