The Postulate of Closest Approach
In the previous chapter we noted that the coexistence of two distinct two-fold rotocenters implies an infinite row of equally spaced two-fold rotocenters (Figure 4-1). Furthermore, we generated a two-dimensional array of four distinct types of two-fold rotocenters by postulating a two-fold rotocenter off the row of two-fold rotocenters already generated (Figure 3-8). The question which we are to address here is what would happen if we placed a third distinct two-fold rotocenter on the line joining the equally spaced rotocenters.
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