An interesting book that looks at Euler's Formula, namely for a polyhedron, the number of Faces plus the number of Vertices (corner points) minus the number of Edges always equals 2, or F + V − E = 2.

The early chapters are light on mathematics, while some people may struggle with the later chapters on topology. But it should be possible to skip them and get the conclusion that Euler's formula that once defined a relationship of polyhedra has now been applied to the larger area of topology, leading to new mathematical findings.