Discord\( \pmb{m = \frac{m_0}{\sqrt{1 - \frac{v^2}{c^2}}}} \) - Relativistic mass
\( \pmb{\vec p = \frac{m_0 \vec V}{\sqrt{1 - \frac{v^2}{c^2}}} \text{ = } \frac{E \vec V}{c^2} } \) - Relativistic momentum
\( \pmb{m_p = \frac{h}{c \lambda}} \) - Relativistic mass of a photon
\( \pmb{\epsilon = h \nu} \) - Energy of a photon
\( \pmb{p_p = \frac{h}{\lambda}} \) - Momentum of a photon
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