Young Suh Kim: 2 books

Einstein's energy–momentum relation is applicable to particles of all speeds, including the particle at rest and the massless particle moving with the speed of light. If one formula or formalism is applicable to all speeds, we say it is "Lorentz-covariant." As for the internal space-time...

Why does North Korea want to possess nuclear capabilities? In order to find the answer to this question, we must have an accurate understanding of the history and structure of the North Korean regime. So far, we have only formed conjectures and predictions regarding North Korea based on our own perspectives;...