Ohanian starts with the experimental evidence for gravitational time dilation, light deflection, and the equivalence principle — long before introducing the full Einstein field equations. This grounds abstract concepts in measurable phenomena.
Transitions to Riemannian geometry and Einstein's full gravitational theory. ohanian gravitation and spacetime pdf
: Unlike many other "standard" texts, Ohanian and Ruffini introduce the linearized theory of gravitation ohanian gravitation and spacetime pdf