Definition of "4-dimensional" [4-dimensional]

• Alternative form of four-dimensional. (adjective)

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• "(There are also issues with using 2-dimensional images to help us think about 4-dimensional spaces, but that can be for later)."
• "For example, in general relativity, the structure is that of a 4-dimensional Lorentzian manifold, the Einstein field equations select a sub-class of all the possible 4-dimensional Lorentzian manifolds, and the choice of boundary conditions or initial conditions selects a particular 4-dimensional Lorentzian manifold within that sub-class."
• "For example, it has been proven that there is no general means of proving whether or not a pair of 'triangulated' 4-dimensional manifolds are homeomorphic (topologically identical)."