This is basically what this book is about: gravity. We will try to convey the concepts of gravity to the reader as Albert Einstein saw it. Einstein saw upon gravity as nobody else before him had seen it. He saw upon gravity as curved spaces, four-dimensional manifolds and geodesics. All of these concepts will be presented in this book.
The book offers a rigorous introduction to Einstein’s general theory of relativity. We start out from the first principles of relativity and present Einstein’s theory in a self-contained way. For the readers convenience, we have included a rough flowchart of chapter dependencies in Appendix D. Such a flowchart is particularly useful if this book is used as a textbook for a course in General Relativity.