Help: Equation format

There are two types of equations. An equation such as
       Y' = <function>
defines the derivative of the variable Y (or the next value of Y, in the case of difference equations). An equation such as
       Y = <function>
defines Y itself as a function of other variables.

The function on the right side of the equation may depend on any other variables (except that circular definitions are not allowed), but may not contain any derivatives.
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