inclusive.
In this formula we see a varying cycle of the first order, and an ordinary cycle of the second order. The latter cycle in this case includes in it the varying cycle.
On inspecting the ten Working-Variables of the diagram, it will be perceived, that although the value on any one of them (excepting
, and
) goes through a series of changes, the office which each performs is in this calculation fixed and invariable. Thus
always prepares the numerators of the factors of any