Desargues

Bosse, A. Maniere universelle de M. Desargues pour practiquer la perspective. Paris Des... 

Figure 3.10 Theorem of Desargues and its dual Dual of Desargues...

Without considering a sixth point the pairs of triangles PRS/P R S and PQR/P Q R, as well as the quadrangles PQRS/P Q R S in Figure 3.14 are perspective in the line g. By the dual of Desargues it follows that they are also perspective in the point O where all pairs of sides intersect. 

As the triangles QRS and Q R S are perspective from the point O Desargues tells us that they are also perspective from the line DE [i.e. g) and hence the sides QS and Q S must meet in g, i.e. at the common point F. 

FIGURE 2.20 The Desargues-Levi graph, which represents degenerate rearrangeents of CH3-CH2, the first graph constructed by Balaban and coworkers to represent degenerate... 

Desargues. Another name recorded on the lunar landscape. The importance of astronomy to the development of mathematics Is reflected In many of the titles given to the moon s lunar features. 

Figure 44. The first reaction graph introduced in chemistry in 1966 by Balaban et to represent degenerate rearrangement of C2H5+, known as the Desargues— Levi graph.

---