Summary: "Step-function" is defined. An analytic formula given for one. If a function in a
substitution is a step function of the variables, the corresponding variable in the
solved equations is a step-function of the time. The effect in a field of a step-function
is discussed, The essential conditions for a break are a cloud of dots, each of which
has a number associated with it saying "change one of the step-functions to this new value" and not a surface as suggested on 898.
Summary: Later we shall have to show how we can break down the minute rigidity of our dynamic
systems, where the minutest change has to be put in and may lead to something profoundly
different. Suggested way of doing it. Break surface no free edge Critical surface has no free edge