4 ms·Or, better yet, e^pi*i + 1 = 0. (My personal preference is E = mc^2.)by Koshkin 7y agoOr, better yet, e^pi*i + 1 = 0. (My personal preference is E = mc^2.)klodolph 7y agoWhy not E^2 = m_0^2 c^4 + p^2 c^2?