The extrinsic method is a mathematical method.
It helps us to get answers to the so-called (E) question. Please discover the basics
and the method in the following document (extern link – new window). I have until
now developed two applications in physics:
geodesic deviation equation for weak gravitational fields; please visit www.researchgate.net;
the 4D project.
Heisenberg’s uncertainty principle for the pair (energy, time).