Pythagoras, Pythagorean, Euclidean, Gravitational Lensing, Symmetry.
expressed in Figure 3? Or even better: What changes in Figure 1, would make us impossible to advance further in the way we have done it in Figure 3? If you read again what was written before, you will recognize that α + β = 90°, is critical in our ability to put together the 4 triangles forming a