Because the initial space ''X'' = 〈''A''〉 is one-dimensional, we can easily fit the second order extension E<sup>2</sup>''X'' = 〈''A'', d''A'', d<sup>2</sup>''A''〉 within the compass of a single venn diagram, charting the couple of converging trajectories as shown in Figure 12. | Because the initial space ''X'' = 〈''A''〉 is one-dimensional, we can easily fit the second order extension E<sup>2</sup>''X'' = 〈''A'', d''A'', d<sup>2</sup>''A''〉 within the compass of a single venn diagram, charting the couple of converging trajectories as shown in Figure 12. |