{\displaystyle m} 指代静止质量,则公式应改写为 E 0 = m c 2 {\displaystyle E_{0}=mc^{2}\,} 而 E = p 2 c 2 + m 2 c 4 = γ m c 2 {\displaystyle E={\sqrt {p^{2}c^{2}+m^{2}c^{4}}}=\gamma
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