| abstract
| - This is a way of classifying universes by how many dimensions they have as well as by what types they are. Despite this page being ultimately about universes or universe level structures, it could potentially be applied to any verse of any level, to any cosmological structure. Dimensions can be spatial, temporal or some other stranger type. The most common case is for there to exist some number of space dimensions and exactly one time dimension. Other possible types of dimensions are probably stranger and examples of those may be hard to find. Compact dimensions have also been described but those are probably just space dimensions with particularly small sizes and, possibly, special curvatures. Therefore they are a special case of a space dimension and not meaningful for this classification. It would also be possible to imagine the existence of compact time dimensions or compact dimensions of any other type one imagines as well. When classifying universes by number of dimensions, as is being done here, compact dimensions should only be counted if they are known to exist inside such universes. Even then, when that is the case, they should be marked as such. A universe with 3 space dimensions plus another compact space one could be defined as (3+1c) space dimensions and could still be classified as 3D in relation to space.
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