“Mathematically, discontinuous functions are difficult to work with. So we have a different kind of neurode whose output is a continuous function of its input. No break in the curve. Let me draw the function out for you.”

“Ah. I see. The output node will be almost zero when the input is minus infinity. It stays close to zero for a long time, but then shifts to one-half when the input is zero, and rises quickly to approach one as the input becomes more positive.”