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## Main Question or Discussion Point

Why does max tegmark's and brian greene's levels of multiverses consider as the highest level the mathematical multiverse hypothesis if other authors like David Lewis consider that there could be also universes non described by maths? Why does it stop at level iv (mathematical universes hypothesis) if there could be other universes not described with maths?

https://en.m.wikipedia.org/wiki/Multiverse

https://en.m.wikipedia.org/wiki/Multiverse