ON THE UNIFICATION PROBLEM IN PHYSICS - THE PAPER OF THEODOR KALUZA

The aim of this book is to present the paper of Theodor Kaluza On the Unification Problem in Physics in about 100 pages. Kaluza left the basic principles of general relativity theory untouched and only added an extra dimension. Amazingly, with this incredible addition, Kaluza has discovered that it can reproduce both Einstein’s equations of gravity and Maxwell’s equations of electromagnetism with one set of relations. The book provides complete derivations of all equations.

Here is the link to the book