::::::Please address my more substantive point: has your equation E<sup>2</sup>=(pc)<sup>2</sup>+(mc<sup>2</sup>)<sup>2</sup> been experimentally verified, or is it simply definitional? | ::::::Please address my more substantive point: has your equation E<sup>2</sup>=(pc)<sup>2</sup>+(mc<sup>2</sup>)<sup>2</sup> been experimentally verified, or is it simply definitional? |