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(- p_{0}^{2} + p^{2} + m_{0}^{2} c^{2}) = 0, kus p_{0} = E / c (E = energia),

${(-p_0^2+p^2+m_0^2c^2)=0, \quad \text{kus} \quad p_0=E/c \space (E=\text{energia}),}$

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