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\section{Introduction}   The most famous equation in physics is $E=mc^2$. However It The formula  is also fairly easy to show that   \begin{equation}   G_{\mu\nu}+ \Lambda g_{\mu\nu}=\frac{8 \pi G}{c^4}T_{\mu\nu}   \end{equation}   These field equations are nonlinear dimensionally consistent  and very difficult to solve. does not depend on any specific system of measurement units.