From the Einstein-de Sitter cosmological model, the critical density of the universe(the density required for the universe to be closed to that expansion stops asymptotically at infinite time) is

where H is the Hubble constant and G is the gravitational constant.
The quantity
is defined as

so a closed universe satisfies
.

where H is the Hubble constant and G is the gravitational constant.
The quantity


so a closed universe satisfies

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