from wikipedia
http://en.wikipedia.org/wiki/Convolution



![(f * g)[n]\ \stackrel{\mathrm{def}}{=}\ \sum_{m=-\infty}^\infty f[m]\, g[n - m]](http://upload.wikimedia.org/math/6/1/3/613174e3c16ef60cfa48baee47da2e4a.png)
Some problems we will discuss
http://ocw.mit.edu/resources/res-6-007-signals-and-systems-spring-2011/assignments/MITRES_6_007S11_hw04.pdf
from MIT ocw
http://ocw.mit.edu/resources/res-6-007-signals-and-systems-spring-2011/video-lectures/lecture-4-convolution/
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