Fun with Dick and Jane at relativistic velocities

Years ago, I found a copy of this unusual children’s book at the back of a storage closet in the Ann Arbor Hands-On Museum. It is out of print, but the authors have kindly given me permission to distribute it here. The book is available in two formats: one that you can read on your computer, and one that you can print and bind yourself.

General Relativity

A brilliant first introduction to differential geometry. Working from a coordinate-free point of view, Wald encourages the reader to make direct contact with geometric objects, rather than viewing them through a haze of numbers. Deft coordinate-free calculations are carried out using abstract index notation. The style is informal, but lays a solid foundation for more rigorous studies. There is also some material on general relativity.

Information Theory, Relative Entropy and Statistics

“In a nutshell, the relative entropy

*K*(*f*||*g*) has two arguments*f*and*g*, which both are probability distributions belonging to the same simplex. Despite formally similar, the arguments are epistemologically contrasted:*f*represents the observations, the data, what*we see*, while*g*represents the expectations, the models, what*we believe.**K*(*f*||*g*) is an asymmetrical measure of dissimilarity between empirical and theoretical distributions, able to capture the various aspects of the confrontation between models and data...”