Relativity by Force

This book presents a new method for simply and rigorously studying the theory of general relativity, without using the sophisticated traditional tools such as quadrivectors, tensors ... This method is simple because it is modeled on classical mechanics and a new definition of force, collinear with acceleration. The emblematic results of relativity are thus calculated with this intuitive and progressive approach to find those of Einstein. At the end, some details should surprise readers, including researchers.