If the universe is an expanding sphere, what space is it expanding into?

Md Ariful Islam

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Md Ariful Islam

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For 3-D sphere, $d/(da)((4/3)pia^3)= 4pia^2$.

I had proved this 40 years ago, for hypersphere, in a paper titled "The rate of change of hypervolume is hypersurface".

I am aware that the space of universe is yet to be identified as a specific Mathematical space. .. .

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