p073fig02.19 Computing with cells: infinity does not exist in biology!<BR>||  Computing in a bounded activity domain, Gedanken experiment (Grossberg 1970).  Vm sub-areas [xm, B - xm], I(all m)], m=[1, i, B].<TABLE border="1"><TR><TD>B</td><TD>excitable sites</td></tr><TR><TD>xi(t)</td><TD>excited sites (activity, potential)</td></tr><TR><TD>B - xi(t)</td><TD>unexcited sites</td></tr></table>