Is 4D visualization necessary?

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Is 4D visualization necessary in order to be successful at math (complex analysis for example)?

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I would argue strongly that it isn't - I can't do it, and have never needed to. While I do study geometric problems, I do it using a lot of algebra, so I don't have to rely heavily on geometric visualization. Even 4D visualization wouldn't help, because a lot of the objects I consider have a lot more than 4 dimensions anyway.

I imagine that it could be helpful it some areas though. For example, a lot of people study 4-manifolds, which are four dimensional geometric objects (although they don't necessarily sit nicely in 4-dimensions; e.g. a hollow sphere is a 2-dimensional object, but you need 3 dimensions to draw it in). Whether some of the techniques they have for understanding them qualify as visualization is up for debate - there are certain pictures one can draw or think of, but they usually don't amount to really "seeing" the whole object.