Lemaître's exponential form of the de Sitter universe (eq. 14): $R=e^{at}$ with $\rho=0$, $k=0$ iff $\Lambda=3a^2$

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Lemaître's exponential form of the de Sitter universe (eq. 14): $R=e^{at}$ with $\rho=0$, $k=0$ iff $\Lambda=3a^2$ · Prove2Me