Recent content by Goldman clarck

Thank you @PeterDonis for the valuable time you spent discussing the thread, really appreciate it.

If ##u = \frac{1}{D}## is correct as an approximation (the source he stated uses the Euler method to solve the light path around a the Schwarzschild spacetime) then how ##u' = \frac{1}{D \cdot tan \alpha}## (which is confusingly denoted as ##v_1(0)## in the paper) was derived from ##u =...

I watched the video he referred to, the video is in french by the way and doesn't provide any explanation to how the second equation has been derived, except mentioning that ##u' = \frac{1}{D \cdot tan \alpha}## is the derivative of ##u = \frac{1}{D}## when ##\phi = 0##, where ##D## is the...