Critical density decides the curvature: $k=0 \iff \rho=\rho_c$, $k>0\iff\rho>\rho_c$, $k<0\iff\rho<\rho_c$ (for $\Lambda=0$)

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Critical density decides the curvature: $k=0 \iff \rho=\rho_c$, $k>0\iff\rho>\rho_c$, $k<0\iff\rho<\rho_c$ (for $\Lambda=0$) · Prove2Me