The starting point. We begin by observing the transformation of trajectories between two frames of reference.
Coordinates Transformation
The Equivalence Principle
The principle of equivalence. How uniform gravitational field is indistinguishable from an accelerating frame of reference.
The Equivalence Principle
The Mathematics in General Relativity
In Special Relativity, we had the Minkowski Space: the 4D space we all know and love. There is a property of this space that can be used to explained it
Geometry of Special Relativity