I actually read this book on my own, I enjoyed it so much. It’s a Math Alphabet book, probably good for matheletes of all ages, starting around 6 or 7. To give you an example of some of the topics, we have A is for Abacus, B in for Binary, C is for Cubit, D is for Diamond, E is for Equilateral and Exponent (they were too excited to just give one E entry), F is for Fibonacci, etc. You get the idea of what level they are at.
Little T and I especially liked “K is for Königsberg” (about the “Königsberg bridge problem), a great example of a network theory problem.
“R is for Rhombicosidodecaheadron” kind of lost us, but we were recaptured by “T is for Tessellate” (when shapes cover a surface with no gaps in between).