Gjej c (complex solution)
\left\{\begin{matrix}c=-m^{-\frac{1}{2}}\sqrt{E}\text{; }c=m^{-\frac{1}{2}}\sqrt{E}\text{, }&m\neq 0\\c\in \mathrm{C}\text{, }&E=0\text{ and }m=0\end{matrix}\right.
Gjej E
E=mc^{2}
Gjej c
\left\{\begin{matrix}c=\sqrt{\frac{E}{m}}\text{; }c=-\sqrt{\frac{E}{m}}\text{, }&\left(E\geq 0\text{ and }m>0\right)\text{ or }\left(E\leq 0\text{ and }m<0\right)\\c\in \mathrm{R}\text{, }&E=0\text{ and }m=0\end{matrix}\right.
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