Poincaré moved knowlage forward but could never let go of the concept of aether.
Einstein’s novel addition were the first and second postulate of SR. This is what allowed him to use the work of Poincaré, Lorentz, Heaviside etc.. and move beyond the falsified concept of aether which absolutely was holding Poincaré back at that point in history.
Einstein’s novel addition were the first and second postulate of SR. This is what allowed him to use the work of Poincaré, Lorentz, Heaviside etc.. and move beyond the falsified concept of aether which absolutely was holding Poincaré back at that point in history.